diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 7808647e4..3cbad3c43 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -112,7 +112,26 @@ jobs:
         ETS_TOOLKIT: qt4
         # empty for push/pull_request, so those runs keep the committed image
         MAYAVI_RENDER_FLAKY: ${{ inputs.render_flaky }}
-      run: python scripts/render_docs.py
+      # under coverage because this is where sixty of the ninety examples are
+      # run -- the other thirty are `pytest examples` in tests.yml.  Every
+      # example is a subprocess, so it reports anything at all only because of
+      # `patch = ["subprocess"]`; render_docs.py chdirs into docs/source, but
+      # the data files still land beside pyproject.toml, where combine wants
+      # them.
+      run: coverage run scripts/render_docs.py
+    - name: Combine coverage
+      if: '!cancelled()'
+      run: |
+        coverage combine
+        coverage xml
+        coverage report --show-missing --skip-covered
+    - uses: codecov/codecov-action@v7.0.0
+      if: '!cancelled()'
+      with:
+        token: ${{ secrets.CODECOV_TOKEN }}
+        files: coverage.xml
+        # informational only -- a failed upload must not fail the job
+        fail_ci_if_error: false
     - name: Report regenerated files
       # --stat alone shows nothing for a figure that is new rather than
       # changed, which is how the gallery went years with images CI rendered
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 15f1efa67..199af75ef 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -230,11 +230,76 @@ jobs:
         files: coverage.xml
         fail_ci_if_error: false
 
+  # The examples the gallery does not render, which is where every other one
+  # is run: examples/tvtk, the explorer application, the four top-level ones,
+  # and the handful that neither show a figure nor open a dialog.  Which those
+  # are is asked of docs/source/render_examples.py rather than listed, so the
+  # two sets cannot drift apart -- between them every example in the repository
+  # is executed on every PR.
+  #
+  # A job of its own for the reasons `integration` is one: they want a display
+  # and the [app] extra, and a step conditioned on the matrix stops running in
+  # silence when the matrix moves under it.  One VTK is enough -- what these
+  # actually exercise is the ETS API the examples are written against, which is
+  # why the `ets: main` row is here and not only on the matrix above: every bug
+  # this suite turned up when it was written (a pyface 8 widget that no longer
+  # creates its own control, taking IVTK's splitter down with a null; a
+  # PipelineBrowser attribute the workbench view had wrong) was that kind.
+  examples:
+    name: Examples ${{ (matrix.ets && 'ets-main') || '' }}
+    strategy:
+      matrix:
+        ets: ['', 'main']
+      fail-fast: false
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        shell: bash
+    timeout-minutes: 20  # the suite takes about a minute
+    env:
+      ETS_TOOLKIT: qt4
+      QT_API: pyside6
+      PYTHONUNBUFFERED: '1'
+    steps:
+    - uses: actions/checkout@v7.0.1
+      with:
+        persist-credentials: false
+        fetch-depth: 0  # setuptools_scm needs the tags
+    - uses: pyvista/setup-headless-display-action@v4
+      with:
+        qt: true
+    - uses: actions/setup-python@v7.0.0
+      with:
+        python-version: '3.14'
+    - run: python -m pip install --upgrade pip  # --group needs pip >= 25.1
+    # scipy is the only third-party import in this set (array_animation.py);
+    # the rendered examples want more, and docs.yml's `docs` group has those
+    - run: python -m pip install --group test pyside6 scipy -ve ".[app]"
+    - uses: ./.github/actions/install-ets-main
+      if: matrix.ets == 'main'
+    - run: python -c "import vtk; print(f'VTK {vtk.VTK_VERSION}')"
+    # every case is a subprocess, so this reports anything at all only because
+    # of `patch = ["subprocess"]`; the wrapper's own per-example timeout is
+    # tighter than pytest's, which is the backstop behind it
+    - run: coverage run -m pytest -v --timeout=180 examples
+    - name: Combine coverage
+      if: '!cancelled()'
+      run: |
+        coverage combine
+        coverage xml
+        coverage report --show-missing --skip-covered
+    - uses: codecov/codecov-action@v7.0.0
+      if: '!cancelled()'
+      with:
+        token: ${{ secrets.CODECOV_TOKEN }}
+        files: coverage.xml
+        fail_ci_if_error: false
+
   # Scheduled runs have no associated PR where a failure would be noticed, so
   # open an issue (if there isn't one already) when they break
   issue-on-failure:
     name: Open issue on scheduled failure
-    needs: [tests, integration]
+    needs: [tests, integration, examples]
     if: failure() && github.event_name == 'schedule'
     runs-on: ubuntu-latest
     permissions:
diff --git a/CLAUDE.md b/CLAUDE.md
index d9d3a2b8b..5fd856e9b 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -37,6 +37,7 @@ python -m build
 # Test suites (CI runs exactly these)
 pytest -v --timeout=10 mayavi
 pytest -sv --timeout=60 tvtk
+pytest -v --timeout=180 examples
 ```
 
 - The files in `integrationtests/mayavi/` are not pytest modules — each is an `optparse` script subclassing `TestCase(Mayavi)`, meant to be run as `python test_contour.py`, and importing one hands pytest `Test*` classes it cannot instantiate.
@@ -45,6 +46,13 @@ pytest -sv --timeout=60 tvtk
   A *step* on a `tests` row was tried first and never ran: `!matrix.vtk` matched nothing because the `vtk-dev` include overrides no original matrix value, so GitHub merges it into the base ubuntu combination instead of adding a row, and every ubuntu row therefore has `vtk` set.
   CI was green throughout.
   A matrix-conditioned step fails silently that way; a job's absence from the checks is visible.
+- `pytest examples` runs the examples the gallery does not, one subprocess each (30 of the 90, ~1 min), in `tests.yml`'s own `examples` job.
+  `mayavi/tests/common.py:run_example_headless` is what the child calls: it stubs out everything an example ends by blocking in — `mlab.show`, `GUI.start_event_loop`, `configure_traits`, `vtkRenderWindowInteractor::Start`, `QApplication.exec` — pushes the same re-raising traits handler the suites use, makes warnings fatal, and runs the rest of the script.
+  The filters are `EXAMPLE_WARNING_FILTERS` in the same file, shared with `scripts/render_docs.py` so that the two halves of the example set hold examples to one standard; pytest's own `filterwarnings` cannot do it, as it applies to the process pytest runs in and every case here is a subprocess.
+  Which examples those are is asked of `render_examples.rendered_examples()` rather than listed, so the two sets cannot drift: an example that stops being rendered starts being run here instead.
+  `user_mayavi.py` and `zzz_reader.py` are the exception (`RUN_AS_MODULE`) — both `sys.exit(1)` when run as `__main__`, being meant for the application to import, so they are run under their own module name for their module body.
+  `examples/conftest.py` keeps pytest from importing the example scripts themselves, as `integrationtests/conftest.py` does.
+  Both `ets` rows run, unlike `integration`'s reasoning about envisage: what these exercise is the ETS API the examples are written against, and every bug the suite found when it was written was ETS drift (pyface 8 widgets that no longer create their own control, which took `IVTK`'s `QSplitter` down with a null; `browser_view.py` reaching for a `PipelineBrowser.ui` that is spelled `_ui`).
 - Regeneration is skipped if `tvtk/tvtk_classes.zip` is < 120 s old (`_tvtk_built_recently` in `setup.py`).
 - Warnings are errors.
   The filters live in `mayavi/tests/conftest.py` and `tvtk/tests/conftest.py` rather than `pyproject.toml`, so that they ship in the wheel and so reach the `pytest --pyargs` runs below and in `wheel.yml`.
@@ -78,6 +86,11 @@ If a warning is genuinely unfixable, add it to `nitpick_ignore` in `docs/source/
   The toolkit is a per-process choice, so `capture_in_subprocess` sets `ETS_TOOLKIT=wx` in the child for any example whose source imports `wx` (`is_wx_example`), and `capture_one` sends it to `capture_wx_dialog` — the wx counterpart of `capture_dialog`, `WindowDC`/`MemoryDC` in place of `QWidget.grab`.
   Note it cannot use `keep_windows_in_background()`, which is Qt-only, so a local render of those two will take focus.
   wxPython has no Linux wheels on PyPI: `docs.yml` takes them from `extras.wxpython.org`, which is published per Ubuntu release and per Python — currently cp313 at the newest, which is why that job pins Python 3.13 and `ubuntu-24.04` rather than `-latest`.
+- `capture_one` pushes a re-raising traits exception handler, as the suites' conftests do.
+  Without it an exception inside a notification handler is printed and swallowed, the example renders a figure with whatever that handler was going to draw missing from it, and the child exits 0 — which throws its output away.
+  That is how `coil_design_application` published a picture of two coils and no magnetic field: `np.NAN` went away in NumPy 2 and the `_get_Bnorm` property that computes the field raised on every call, silently (gh-1418).
+- `render_examples.rendered_examples()` is the list of examples the gallery runs, and `examples/test_examples.py` runs the complement, so between the two every example is executed on every PR.
+  `EXAMPLE_DIR` is absolute for that reason — the helper has to answer the same thing from outside `docs/source`.
 - Parts of `docs/source/mayavi/auto/` are generated: `mlab_reference.py` (repo root) emits the mlab API reference, `docs/source/render_examples.py` emits the example gallery.
   Both are re-run in CI and both are also committed, so a plain `make -C docs html` works offline — which means a generator change must be committed **together with** its regenerated output, or `-W` fails on the stale copies.
 - Regenerate with `python scripts/render_docs.py`, which drives all of them in the right order.
@@ -102,7 +115,8 @@ If a warning is genuinely unfixable, add it to `nitpick_ignore` in `docs/source/
   They were `enthought_mayavi_mlab_*` until 2026-07, from the pre-2010 `enthought.mayavi` package name — which meant `mlab_reference.py` looked for names that did not exist and the mlab reference shipped with no illustrations at all for years.
 - A rebuild is byte-for-byte reproducible, so regenerating shows a diff only where something really changed: the doc version is truncated to `4.8.4.dev` (the commit and date would retitle every page), `html_last_updated_fmt` is off with the build date carried by the site landing page alone, and the renderers seed `np.random` because several `mlab.test_*` functions plot random data.
   `FLAKY_EXAMPLES` in `render_examples.py` names the examples that still are not reproducible: `tvtk_in_mayavi` and `magnetic_field`, which draw overlapping translucent actors that VTK composites differently in ~1% of pixels (roughly one run in five, and three of four, respectively), and `wx_mayavi_embed_in_notebook`, a screenshot of a wx window whose notebook lands differently — it came back changed in two of the four CI runs after it was added, on the committed bytes both times.
-  Their committed images are reused rather than re-rendered, so the published figures stop flipping back and forth; set `MAYAVI_RENDER_FLAKY=1` (or tick `render_flaky` on a `workflow_dispatch`) to redo them deliberately.
+  They are still *run* — that is the only place they ever run — but their figure goes to a scratch directory and the committed image stays put, so the published figures stop flipping back and forth; set `MAYAVI_RENDER_FLAKY=1` (or tick `render_flaky` on a `workflow_dispatch`) to redo them deliberately.
+  Skipping the run as well is what let `magnetic_field` sit broken: `np.arctan(x/y)` divides by zero on the axis of the coil, which is fatal under the render's warnings-as-errors, and nothing had executed it since the warnings became fatal.
   For the first two, enabling depth peeling (it does engage — `last_rendering_used_depth_peeling` is 1) and forcing a `scene.render()` before the capture were both measured over ten runs and neither helps, so leave it alone rather than re-testing.
   Beware that five runs is not enough to call this stable; that sample size gave a false positive twice.
 - `mlab.savefig` honours the display's device pixel ratio, and neither `magnification=1` nor an explicit `size` overrides it, so a HiDPI display would give images 2x the size of CI's.
@@ -141,6 +155,8 @@ If the change touched a VTK workaround in any form — a `vtk_*_version` or `sys
     Hence the `pip uninstall` first, and `assert_from_main.py` after, which reads each distribution's `direct_url.json`: nothing else distinguishes a real `main` install from a fall back to PyPI, and the row would be green either way.
     The package list lives only in `requirements.txt` — `pip uninstall` takes it with `-r` and the script parses it — so the three uses cannot drift.
   - It runs *after* the package install so nothing can undo it, which is why `pip check` stands in for the floor checking that installing first would have got from the resolver.
+- The `examples` job runs `pytest examples` — the thirty examples the gallery does not render — under coverage, on both `ets` rows.
+  See **Building and testing locally** above for what it covers and why the ETS matrix is there.
 - `.github/actions/open-issue` — composite action behind both `issue-on-failure` jobs: files an issue unless one with the same title is already open, appending the run URL.
   Callers need an `actions/checkout` (sparse is enough) because a local action has to be on disk to be used, and `permissions: issues: write`.
 - `wheel.yml` — mismatch matrix: build per-OS wheels against latest VTK, test them against all supported older VTKs (rows deliberately mirror `tests.yml` so failures are attributable to the mismatch), `twine check --strict`, and trusted publishing to PyPI on GitHub releases (environment `pypi`, `needs: [build, test, check]`).
@@ -150,6 +166,9 @@ If the change touched a VTK workaround in any form — a `vtk_*_version` or `sys
   Doc build requirements live in the `docs` dependency group (PEP 735, `pip --group`), so the whole install is one `pip install --group docs -ve ".[app]"`.
   Unlike `tests.yml` this build is *not* `--no-build-isolation`: nothing here pins an older VTK, so letting the isolated build fetch the latest is fine.
   To review a PR's rendered docs, download the `docs-site` artifact and serve it (`python -m http.server`); GitHub has no linked HTML preview, and `deploy-pages`' `preview` input is alpha-gated.
+  The render step runs under `coverage run` and uploads to codecov like the other jobs: it is where sixty of the ninety examples execute, and every one of them is a subprocess, so it measures anything at all only because of `patch = ["subprocess"]`.
+  `render_docs.py` chdirs into `docs/source`, but coverage anchors its data files to the config it was started from, so they still land beside `pyproject.toml` where `coverage combine` wants them.
+  The generator itself stays unmeasured here — this build is isolated, and `tests.yml`'s install step is the one that covers it.
   See **Documentation** below.
 
 ## Gotchas
diff --git a/docs/source/mayavi/auto/coil_design_application.py b/docs/source/mayavi/auto/coil_design_application.py
index 4172ea42e..09e7ee7ae 100644
--- a/docs/source/mayavi/auto/coil_design_application.py
+++ b/docs/source/mayavi/auto/coil_design_application.py
@@ -185,10 +185,10 @@ def _get_Bnorm(self):
         # to use an ImageData
         Bmax = 10 * np.median(Bnorm)
 
-        Bx[Bnorm > Bmax] = np.NAN
-        By[Bnorm > Bmax] = np.NAN
-        Bz[Bnorm > Bmax] = np.NAN
-        Bnorm[Bnorm > Bmax] = np.NAN
+        Bx[Bnorm > Bmax] = np.nan
+        By[Bnorm > Bmax] = np.nan
+        Bz[Bnorm > Bmax] = np.nan
+        Bnorm[Bnorm > Bmax] = np.nan
 
         self.Bx = Bx
         self.By = By
diff --git a/docs/source/mayavi/auto/datasets.py b/docs/source/mayavi/auto/datasets.py
index a6d6a820a..47d156ea4 100644
--- a/docs/source/mayavi/auto/datasets.py
+++ b/docs/source/mayavi/auto/datasets.py
@@ -116,19 +116,20 @@ def unstructured_grid():
     cells = array([4, 0, 1, 2, 3, # tetra
                    8, 4, 5, 6, 7, 8, 9, 10, 11 # hex
                    ])
-    # The offsets for the cells, i.e. the indices where the cells
-    # start.
-    offset = array([0, 5])
     tetra_type = tvtk.Tetra().cell_type # VTK_TETRA == 10
     hex_type = tvtk.Hexahedron().cell_type # VTK_HEXAHEDRON == 12
     cell_types = array([tetra_type, hex_type])
-    # Create the array of cells unambiguously.
+    # Create the array of cells unambiguously.  The cell array keeps the
+    # offsets itself, so there is no separate list of them to build: VTK 9.6
+    # deprecated both the CellArray.set_cells that took a count and the
+    # UnstructuredGrid.set_cells that took cell locations, and 9.7 removed the
+    # first of them outright.
     cell_array = tvtk.CellArray()
-    cell_array.set_cells(2, cells)
+    cell_array.import_legacy_format(cells)
     # Now create the UG.
     ug = tvtk.UnstructuredGrid(points=points)
     # Now just set the cell types and reuse the ug locations and cells.
-    ug.set_cells(cell_types, offset, cell_array)
+    ug.set_cells(cell_types, cell_array)
     scalars = random.random(points.shape[0])
     ug.point_data.scalars = scalars
     ug.point_data.scalars.name = 'scalars'
diff --git a/docs/source/mayavi/auto/magnetic_field.py b/docs/source/mayavi/auto/magnetic_field.py
index 1b270b019..1cda3400f 100644
--- a/docs/source/mayavi/auto/magnetic_field.py
+++ b/docs/source/mayavi/auto/magnetic_field.py
@@ -108,19 +108,22 @@ def magnetic_field(r, n, r0, R):
     y = r[:, 1]
     z = r[:, 2]
     rho = np.sqrt(x**2 + y**2)
-    theta = np.arctan(x/y)
-    theta[y==0] = 0
-
-    E = special.ellipe((4 * R * rho)/( (R + rho)**2 + z**2))
-    K = special.ellipk((4 * R * rho)/( (R + rho)**2 + z**2))
-    Bz =  1/np.sqrt((R + rho)**2 + z**2) * (
-                K
-              + E * (R**2 - rho**2 - z**2)/((R - rho)**2 + z**2)
-              )
-    Brho = z/(rho*np.sqrt((R + rho)**2 + z**2)) * (
-               -K
-              + E * (R**2 + rho**2 + z**2)/((R - rho)**2 + z**2)
-              )
+    # on the axis of the coil rho and y are zero, so several of these divide by
+    # zero; what that produces is replaced just below
+    with np.errstate(divide='ignore', invalid='ignore'):
+        theta = np.arctan(x/y)
+        theta[y==0] = 0
+
+        E = special.ellipe((4 * R * rho)/( (R + rho)**2 + z**2))
+        K = special.ellipk((4 * R * rho)/( (R + rho)**2 + z**2))
+        Bz =  1/np.sqrt((R + rho)**2 + z**2) * (
+                    K
+                  + E * (R**2 - rho**2 - z**2)/((R - rho)**2 + z**2)
+                  )
+        Brho = z/(rho*np.sqrt((R + rho)**2 + z**2)) * (
+                   -K
+                  + E * (R**2 + rho**2 + z**2)/((R - rho)**2 + z**2)
+                  )
     # On the axis of the coil we get a divided by zero here. This returns a
     # NaN, where the field is actually zero :
     Brho[np.isnan(Brho)] = 0
diff --git a/docs/source/mayavi/auto/mlab_visual.py b/docs/source/mayavi/auto/mlab_visual.py
index dc3661793..ea0a5cb8d 100644
--- a/docs/source/mayavi/auto/mlab_visual.py
+++ b/docs/source/mayavi/auto/mlab_visual.py
@@ -34,8 +34,8 @@
 
 # Even sillier animation.
 b1 = visual.box()
-b2 = visual.box(x=4., color=visual.color.red)
-b3 = visual.box(x=-4, color=visual.color.red)
+b2 = visual.box(x=4., color=(1, 0, 0))
+b3 = visual.box(x=-4, color=(1, 0, 0))
 b1.v = 5.0
 
 @mlab.show
diff --git a/docs/source/mayavi/generated_images/example_coil_design_application.jpg b/docs/source/mayavi/generated_images/example_coil_design_application.jpg
index cbd4bdfeb..ca6fa7783 100644
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diff --git a/docs/source/mayavi/generated_images/example_compute_in_thread.jpg b/docs/source/mayavi/generated_images/example_compute_in_thread.jpg
index 8d011bc3c..cc97402ff 100644
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diff --git a/docs/source/mayavi/generated_images/example_contour.jpg b/docs/source/mayavi/generated_images/example_contour.jpg
index 4c6db6477..7fc5f2448 100644
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diff --git a/docs/source/mayavi/generated_images/example_contour_contour.jpg b/docs/source/mayavi/generated_images/example_contour_contour.jpg
index 5034794f2..1fed548b9 100644
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diff --git a/docs/source/mayavi/generated_images/example_delaunay_graph.jpg b/docs/source/mayavi/generated_images/example_delaunay_graph.jpg
index 36e83ee55..b4f39fcc3 100644
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index 2503565b2..50e21e374 100644
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diff --git a/docs/source/mayavi/generated_images/example_lorenz.jpg b/docs/source/mayavi/generated_images/example_lorenz.jpg
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diff --git a/docs/source/mayavi/generated_images/example_lorenz_ui.jpg b/docs/source/mayavi/generated_images/example_lorenz_ui.jpg
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index e05f028dc..546a72ba5 100644
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index 610e1fb74..82c8ada27 100644
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diff --git a/docs/source/mayavi/generated_images/example_polydata.jpg b/docs/source/mayavi/generated_images/example_polydata.jpg
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diff --git a/docs/source/mayavi/generated_images/example_qt_embedding.jpg b/docs/source/mayavi/generated_images/example_qt_embedding.jpg
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diff --git a/docs/source/mayavi/generated_images/example_scatter_plot.jpg b/docs/source/mayavi/generated_images/example_scatter_plot.jpg
index 9144f6428..2b9735d73 100644
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diff --git a/docs/source/mayavi/generated_images/example_streamline.jpg b/docs/source/mayavi/generated_images/example_streamline.jpg
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diff --git a/docs/source/mayavi/generated_images/example_structured_grid.jpg b/docs/source/mayavi/generated_images/example_structured_grid.jpg
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diff --git a/docs/source/mayavi/generated_images/example_structured_points2d.jpg b/docs/source/mayavi/generated_images/example_structured_points2d.jpg
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diff --git a/docs/source/mayavi/generated_images/example_structured_points3d.jpg b/docs/source/mayavi/generated_images/example_structured_points3d.jpg
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diff --git a/docs/source/mayavi/generated_images/example_superquad_with_gui.jpg b/docs/source/mayavi/generated_images/example_superquad_with_gui.jpg
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diff --git a/docs/source/mayavi/generated_images/example_surf_regular_mlab.jpg b/docs/source/mayavi/generated_images/example_surf_regular_mlab.jpg
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diff --git a/docs/source/mayavi/generated_images/example_unstructured_grid.jpg b/docs/source/mayavi/generated_images/example_unstructured_grid.jpg
index c63e763d8..d83d58e87 100644
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diff --git a/docs/source/mayavi/generated_images/mayavi_mlab_fancy_mesh.jpg b/docs/source/mayavi/generated_images/mayavi_mlab_fancy_mesh.jpg
index b6b7371af..1657abcea 100644
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diff --git a/docs/source/render_examples.py b/docs/source/render_examples.py
index 7b3441f36..4ab5e11d3 100644
--- a/docs/source/render_examples.py
+++ b/docs/source/render_examples.py
@@ -23,11 +23,20 @@
 
 # Enthought imports
 from mayavi import mlab
+from traits.api import push_exception_handler
 
 # A global counter, for subsitutions.
 global_counter = itertools.count()
 
-EXAMPLE_DIR = '../../examples/mayavi'
+# absolute, so that `rendered_examples` below answers the same thing wherever
+# it is called from -- examples/test_examples.py imports it to work out which
+# examples the gallery leaves for it to run
+EXAMPLE_DIR = str(Path(__file__).resolve().parents[2] / 'examples' / 'mayavi')
+
+# The gallery sections, in the order render_examples() writes them.  The fifth,
+# the top-level "Misc examples", is listed rather than rendered.
+GALLERY_SECTIONS = ('mlab', 'interactive', 'advanced_visualization',
+                    'data_interaction')
 
 # Examples whose figure differs from run to run, so that re-rendering would flip
 # the published image back and forth for no gain.  The first two draw
@@ -501,6 +510,13 @@ def capture_one(filename, image_file):
     """ Renders one example, the way that suits it.  Runs in the child.
     """
     apply_unsettable_warning_filters()
+    # Traits prints an exception raised in a notification handler and carries
+    # on, so an example that breaks inside one still renders -- a figure with
+    # whatever the handler was going to draw missing from it -- and the child
+    # exits 0, which throws its output away.  That is how coil_design_application
+    # published a picture of two coils and no magnetic field for as long as it
+    # did.  The suites push the same handler from their conftests.
+    push_exception_handler(reraise_exceptions=True)
     # An error reported in a modal box is a hang here: nobody is watching to
     # click it away, the per-example timeout is what ends it, and the message
     # -- the only thing that says what went wrong -- dies inside the box.
@@ -563,6 +579,39 @@ def capture_in_subprocess(filename, image_file):
         shutil.rmtree(state, ignore_errors=True)
 
 
+def renders_a_figure(filename):
+    """ Whether the gallery runs this example to make a figure of it.
+
+        `examples/test_examples.py` runs the ones this says no to, so that
+        between the two every example is executed somewhere.  A flaky example
+        says yes: its committed image is kept, but it is still run.
+    """
+    if os.path.splitext(os.path.basename(filename))[0] in SKIP_EXAMPLES:
+        return False
+    return (is_dialog_example(filename) or is_mlab_example(filename)
+            or is_app_example(filename))
+
+
+def collected_examples(section):
+    """ The examples one gallery section lists, shortest (simplest) first.
+    """
+    files = glob.glob(os.path.join(EXAMPLE_DIR, section, '*.py'))
+    if section == 'mlab':
+        # that directory also holds examples belonging to no section
+        files = [name for name in files if is_mlab_example(name)]
+    return sorted(files,
+                  key=lambda name: (len(Path(name).read_text().splitlines()),
+                                    name))
+
+
+def rendered_examples():
+    """ Every example the gallery runs, as absolute paths.
+    """
+    return {os.path.abspath(name) for section in GALLERY_SECTIONS
+            for name in collected_examples(section)
+            if renders_a_figure(name)}
+
+
 def capture_example(filename, short_file_name, image_file):
     """ Renders one example's figure, picking the way that suits it.
 
@@ -572,20 +621,27 @@ def capture_example(filename, short_file_name, image_file):
     if short_file_name in SKIP_EXAMPLES:
         print("Skipping %s: %s" % (filename, SKIP_EXAMPLES[short_file_name]))
         return
-    if not should_render(short_file_name, image_file):
-        print("Keeping the committed image for %s; it does not render "
-              "reproducibly (set MAYAVI_RENDER_FLAKY=1 to redo it)" % filename)
-        return
-    if not (is_dialog_example(filename) or is_mlab_example(filename)
-            or is_app_example(filename)):
+    if not renders_a_figure(filename):
         print("Skipping %s: it neither shows a figure nor opens a dialog"
               % filename)
         return
     print("Generating images for %s" % filename, flush=True)
+    # A flaky example is still run -- it has to keep working, and this is the
+    # only place it ever runs -- but its figure goes to a scratch directory and
+    # the committed one stays put, so the published image stops flipping back
+    # and forth.
+    keep_committed = not should_render(short_file_name, image_file)
+    scratch = tempfile.mkdtemp(prefix='mayavi-flaky-') if keep_committed else None
+    target = (os.path.join(scratch, os.path.basename(image_file))
+              if keep_committed else image_file)
     try:
-        capture_in_subprocess(filename, image_file)
-        if not os.path.exists(image_file):
+        capture_in_subprocess(filename, target)
+        if not os.path.exists(target):
             raise RuntimeError('rendered without leaving an image behind')
+        if keep_committed:
+            print("Keeping the committed image for %s; it does not render "
+                  "reproducibly (set MAYAVI_RENDER_FLAKY=1 to redo it)"
+                  % filename)
     except Exception as exc:
         # one broken example should not cost the gallery every later figure
         RENDER_FAILURES.append('%s: %s: %s'
@@ -611,6 +667,9 @@ def capture_example(filename, short_file_name, image_file):
                     lines = (lines[:30] + ['    ... %d lines omitted ...'
                                            % (len(lines) - 70)] + lines[-40:])
                 print(textwrap.indent('\n'.join(lines), '    '), flush=True)
+    finally:
+        if scratch is not None:
+            shutil.rmtree(scratch, ignore_errors=True)
 
 
 def is_mlab_example(filename):
@@ -1055,13 +1114,7 @@ def render_examples(render_images=False, out_dir='mayavi/auto'):
 
     ##########################################################################
     # Mlab examples
-    example_files = [ filename
-                    for filename in glob.glob(os.path.join(EXAMPLE_DIR,
-                        'mlab', '*.py'))
-                    if is_mlab_example(filename)]
-    # Sort by file length (gives a measure of the complexity of the
-    # example)
-    example_files.sort(key=lambda name: (len(Path(name).read_text().splitlines()), name))
+    example_files = collected_examples('mlab')
 
     mlab_example_lister = MlabExampleLister(render_images=render_images,
                                         out_dir=out_dir,
@@ -1074,12 +1127,7 @@ def render_examples(render_images=False, out_dir='mayavi/auto'):
 
     ##########################################################################
     # Interactive application examples
-    example_files = [ filename
-                    for filename in glob.glob(os.path.join(EXAMPLE_DIR,
-                        'interactive', '*.py'))]
-    # Sort by file length (gives a measure of the complexity of the
-    # example)
-    example_files.sort(key=lambda name: (len(Path(name).read_text().splitlines()), name))
+    example_files = collected_examples('interactive')
     example_lister = RenderedExampleLister(
             render_images=render_images,
             images_dir='mayavi/generated_images',
@@ -1095,12 +1143,7 @@ def render_examples(render_images=False, out_dir='mayavi/auto'):
 
     ##########################################################################
     # Advanced visualization examples
-    example_files = [ filename
-                    for filename in glob.glob(os.path.join(EXAMPLE_DIR,
-                        'advanced_visualization', '*.py'))]
-    # Sort by file length (gives a measure of the complexity of the
-    # example)
-    example_files.sort(key=lambda name: (len(Path(name).read_text().splitlines()), name))
+    example_files = collected_examples('advanced_visualization')
     example_lister = RenderedExampleLister(
             render_images=render_images,
             images_dir='mayavi/generated_images',
@@ -1115,12 +1158,7 @@ def render_examples(render_images=False, out_dir='mayavi/auto'):
 
     ##########################################################################
     # Data interaction examples
-    example_files = [ filename
-                    for filename in glob.glob(os.path.join(EXAMPLE_DIR,
-                        'data_interaction', '*.py'))]
-    # Sort by file length (gives a measure of the complexity of the
-    # example)
-    example_files.sort(key=lambda name: (len(Path(name).read_text().splitlines()), name))
+    example_files = collected_examples('data_interaction')
     example_lister = RenderedExampleLister(
             render_images=render_images,
             images_dir='mayavi/generated_images',
diff --git a/examples/conftest.py b/examples/conftest.py
new file mode 100644
index 000000000..567efff1b
--- /dev/null
+++ b/examples/conftest.py
@@ -0,0 +1,9 @@
+"""Keep pytest out of the example scripts themselves."""
+# Copyright (c) Enthought, Inc.
+# License: BSD Style.
+
+# The examples are scripts, not test modules: importing one builds a scene,
+# opens a dialog or stands the Mayavi2 application up at import time.
+# test_examples.py, beside this file, runs them the way they expect -- one
+# subprocess each -- so it is collected normally.
+collect_ignore_glob = ['mayavi/*', 'tvtk/*']
diff --git a/examples/mayavi/advanced_visualization/datasets.py b/examples/mayavi/advanced_visualization/datasets.py
index a6d6a820a..47d156ea4 100644
--- a/examples/mayavi/advanced_visualization/datasets.py
+++ b/examples/mayavi/advanced_visualization/datasets.py
@@ -116,19 +116,20 @@ def unstructured_grid():
     cells = array([4, 0, 1, 2, 3, # tetra
                    8, 4, 5, 6, 7, 8, 9, 10, 11 # hex
                    ])
-    # The offsets for the cells, i.e. the indices where the cells
-    # start.
-    offset = array([0, 5])
     tetra_type = tvtk.Tetra().cell_type # VTK_TETRA == 10
     hex_type = tvtk.Hexahedron().cell_type # VTK_HEXAHEDRON == 12
     cell_types = array([tetra_type, hex_type])
-    # Create the array of cells unambiguously.
+    # Create the array of cells unambiguously.  The cell array keeps the
+    # offsets itself, so there is no separate list of them to build: VTK 9.6
+    # deprecated both the CellArray.set_cells that took a count and the
+    # UnstructuredGrid.set_cells that took cell locations, and 9.7 removed the
+    # first of them outright.
     cell_array = tvtk.CellArray()
-    cell_array.set_cells(2, cells)
+    cell_array.import_legacy_format(cells)
     # Now create the UG.
     ug = tvtk.UnstructuredGrid(points=points)
     # Now just set the cell types and reuse the ug locations and cells.
-    ug.set_cells(cell_types, offset, cell_array)
+    ug.set_cells(cell_types, cell_array)
     scalars = random.random(points.shape[0])
     ug.point_data.scalars = scalars
     ug.point_data.scalars.name = 'scalars'
diff --git a/examples/mayavi/advanced_visualization/magnetic_field.py b/examples/mayavi/advanced_visualization/magnetic_field.py
index 1b270b019..1cda3400f 100644
--- a/examples/mayavi/advanced_visualization/magnetic_field.py
+++ b/examples/mayavi/advanced_visualization/magnetic_field.py
@@ -108,19 +108,22 @@ def magnetic_field(r, n, r0, R):
     y = r[:, 1]
     z = r[:, 2]
     rho = np.sqrt(x**2 + y**2)
-    theta = np.arctan(x/y)
-    theta[y==0] = 0
-
-    E = special.ellipe((4 * R * rho)/( (R + rho)**2 + z**2))
-    K = special.ellipk((4 * R * rho)/( (R + rho)**2 + z**2))
-    Bz =  1/np.sqrt((R + rho)**2 + z**2) * (
-                K
-              + E * (R**2 - rho**2 - z**2)/((R - rho)**2 + z**2)
-              )
-    Brho = z/(rho*np.sqrt((R + rho)**2 + z**2)) * (
-               -K
-              + E * (R**2 + rho**2 + z**2)/((R - rho)**2 + z**2)
-              )
+    # on the axis of the coil rho and y are zero, so several of these divide by
+    # zero; what that produces is replaced just below
+    with np.errstate(divide='ignore', invalid='ignore'):
+        theta = np.arctan(x/y)
+        theta[y==0] = 0
+
+        E = special.ellipe((4 * R * rho)/( (R + rho)**2 + z**2))
+        K = special.ellipk((4 * R * rho)/( (R + rho)**2 + z**2))
+        Bz =  1/np.sqrt((R + rho)**2 + z**2) * (
+                    K
+                  + E * (R**2 - rho**2 - z**2)/((R - rho)**2 + z**2)
+                  )
+        Brho = z/(rho*np.sqrt((R + rho)**2 + z**2)) * (
+                   -K
+                  + E * (R**2 + rho**2 + z**2)/((R - rho)**2 + z**2)
+                  )
     # On the axis of the coil we get a divided by zero here. This returns a
     # NaN, where the field is actually zero :
     Brho[np.isnan(Brho)] = 0
diff --git a/examples/mayavi/interactive/mlab_visual.py b/examples/mayavi/interactive/mlab_visual.py
index dc3661793..ea0a5cb8d 100644
--- a/examples/mayavi/interactive/mlab_visual.py
+++ b/examples/mayavi/interactive/mlab_visual.py
@@ -34,8 +34,8 @@
 
 # Even sillier animation.
 b1 = visual.box()
-b2 = visual.box(x=4., color=visual.color.red)
-b3 = visual.box(x=-4, color=visual.color.red)
+b2 = visual.box(x=4., color=(1, 0, 0))
+b3 = visual.box(x=-4, color=(1, 0, 0))
 b1.v = 5.0
 
 @mlab.show
diff --git a/examples/test_examples.py b/examples/test_examples.py
new file mode 100644
index 000000000..776c30df5
--- /dev/null
+++ b/examples/test_examples.py
@@ -0,0 +1,69 @@
+"""Run the examples the gallery does not, one subprocess per script.
+
+``docs/source/render_examples.py`` executes every example it can shoot a
+figure of, which is most of ``examples/mayavi``.  This covers the rest --
+``examples/tvtk``, the explorer application, the top-level ones, and the few
+in the gallery directories that neither show a figure nor open a dialog -- so
+that between the two every example in the repository is run somewhere.
+
+Which examples those are is asked of the renderer rather than listed here: one
+that stops being rendered starts being run by this instead, with no list to
+keep in step.
+"""
+# Copyright (c) Enthought, Inc.
+# License: BSD Style.
+
+import subprocess
+import sys
+from pathlib import Path
+
+import pytest
+
+HERE = Path(__file__).resolve().parent
+DOCS_SOURCE = HERE.parent / 'docs' / 'source'
+
+# No example takes anything like this long; it is here so that one that will
+# never finish fails the run instead of hanging it.
+TIMEOUT = 120
+
+
+def _rendered_examples():
+    """The examples the gallery runs, from the renderer that runs them."""
+    # docs/source holds mayavi/ and tvtk/ subdirectories, and a namespace
+    # package beats an installed one wherever it turns up on sys.path -- so
+    # bind the real ones before putting it there.  See CLAUDE.md.
+    import mayavi                                      # noqa: F401
+    import tvtk.api                                    # noqa: F401
+    sys.path.insert(0, str(DOCS_SOURCE))
+    try:
+        from render_examples import rendered_examples
+        return rendered_examples()
+    finally:
+        sys.path.remove(str(DOCS_SOURCE))
+
+
+def _unrendered_examples():
+    every = {path.resolve() for path in HERE.glob('*/**/*.py')
+             if path.name != 'conftest.py'}
+    return sorted(every - {Path(name) for name in _rendered_examples()})
+
+
+EXAMPLES = _unrendered_examples()
+
+
+@pytest.mark.parametrize(
+    'example', EXAMPLES, ids=[str(path.relative_to(HERE)) for path in EXAMPLES])
+def test_example(example, tmp_path):
+    # a fresh working directory each time: several examples write a file
+    # beside themselves (off_screen.py's example.png, the mayavi2 application's
+    # saved window layout), and none of these read one
+    code = ('from mayavi.tests.common import run_example_headless\n'
+            'run_example_headless(%r)\n' % str(example))
+    proc = subprocess.run([sys.executable, '-c', code], cwd=tmp_path,
+                          timeout=TIMEOUT, capture_output=True, text=True)
+    if proc.returncode != 0:
+        pytest.fail(
+            '%s failed (exit status %d)\n\n--- stdout ---\n%s\n--- stderr ---\n%s'
+            % (example.relative_to(HERE), proc.returncode, proc.stdout[-3000:],
+               proc.stderr[-3000:]),
+            pytrace=False)
diff --git a/examples/tvtk/dscene.py b/examples/tvtk/dscene.py
index 46e89a700..c84e30690 100644
--- a/examples/tvtk/dscene.py
+++ b/examples/tvtk/dscene.py
@@ -163,6 +163,7 @@ def _create_rhs(self, parent):
         """ Creates the right hand side or bottom depending on the style. """
 
         self.python_shell = PythonShell(parent)
+        self.python_shell.create()
         self.python_shell.bind('scene', self.scene)
         self.python_shell.bind('s', self.scene)
 
diff --git a/examples/tvtk/off_screen.py b/examples/tvtk/off_screen.py
index 42f52bf56..3a781984e 100644
--- a/examples/tvtk/off_screen.py
+++ b/examples/tvtk/off_screen.py
@@ -47,7 +47,7 @@
 rw.add_renderer(ren)
 
 w2if = tvtk.WindowToImageFilter()
-w2if.magnification = 2
+w2if.scale = (2, 2)
 w2if.input = rw
 ex = tvtk.PNGWriter()
 ex.file_name = "example.png"
diff --git a/examples/tvtk/scene.py b/examples/tvtk/scene.py
index 9ce6ccd71..334d6a4c3 100644
--- a/examples/tvtk/scene.py
+++ b/examples/tvtk/scene.py
@@ -163,6 +163,7 @@ def _create_rhs(self, parent):
         """ Creates the right hand side or bottom depending on the style. """
 
         self.python_shell = PythonShell(parent)
+        self.python_shell.create()
         self.python_shell.bind('scene', self.scene)
         self.python_shell.bind('s', self.scene)
 
diff --git a/examples/tvtk/visual/gyro.py b/examples/tvtk/visual/gyro.py
index 44692c659..e61cd731c 100644
--- a/examples/tvtk/visual/gyro.py
+++ b/examples/tvtk/visual/gyro.py
@@ -7,7 +7,7 @@
 from math import atan, cos, sin, pi
 
 from tvtk.tools.visual import vector, MVector, Box, Helix, Frame, \
-    Cylinder, curve, color, iterate, show
+    Cylinder, curve, iterate, show
 
 
 top = vector(0,1.,0) # where top of spring is held
@@ -50,10 +50,10 @@
 rotor = Cylinder(pos = 0.5*gyro1.axis*(Lshaft-Drotor), axis =
                  gyro1.axis*Drotor, radius = Rrotor, color = (0.5,0.5,0.5), length = 0.1)
 
-stripe1 = curve(color = color.green,
+stripe1 = curve(color = (0, 1, 0),
                 points = [rotor.pos+1.03*rotor.axis+vector(0,Rrotor,0),
                 rotor.pos+1.03*rotor.axis-vector(0,Rrotor,0)])
-stripe2 = curve(color = color.green,
+stripe2 = curve(color = (0, 1, 0),
                 points = [rotor.pos-0.03*rotor.axis+vector(0,Rrotor,0),
                 rotor.pos-0.03*rotor.axis-vector(0,Rrotor,0)])
 
diff --git a/mayavi/plugins/_workbench_fixes.py b/mayavi/plugins/_workbench_fixes.py
index e185df135..3fdaae8b8 100644
--- a/mayavi/plugins/_workbench_fixes.py
+++ b/mayavi/plugins/_workbench_fixes.py
@@ -6,6 +6,11 @@
 (mayavi gh-1409, pyface gh-1263).  pyface gh-1264 fixed it on main, but
 pyface's latest release (8.0.0) predates that commit, so mayavi patches the
 method itself until a release carries the fix -- see tvtk/WORKAROUNDS.md.
+
+The Python shell view the workbench opens needs one more of these: pyface's
+console widget names an enum PyQt6 dropped.  That fix used to hang off a
+`fix_python_shell_view` that envisage 8.0.1 made unnecessary, and went out with
+it; it is independent of envisage and still needed.
 """
 # License: BSD Style.
 
@@ -36,3 +41,22 @@ def is_node_for(self, obj):
 
     IViewTreeNode.is_node_for = is_node_for
     logger.debug('Patched pyface IViewTreeNode.is_node_for (gh-1409)')
+
+
+def restore_qfont_typewriter():
+    """Put back the ``QFont.TypeWriter`` alias PyQt6 dropped, for pyface.
+
+    pyface names that style hint unscoped, the way PyQt5 and PySide expose it,
+    in its console widget, its code editor and its font registry.  PyQt6 has
+    only the scoped enums, so building the Python shell there raises
+    ``AttributeError: type object 'QFont' has no attribute 'TypeWriter'``.  One
+    alias covers every one of those call sites.
+    """
+    try:
+        from pyface.qt import QtGui
+    except ImportError:     # a toolkit with no Qt behind it
+        return
+    if hasattr(QtGui.QFont, 'TypeWriter'):
+        return
+    QtGui.QFont.TypeWriter = QtGui.QFont.StyleHint.TypeWriter
+    logger.debug('Restored QFont.TypeWriter for pyface (gh-1409)')
diff --git a/mayavi/plugins/mayavi_workbench_application.py b/mayavi/plugins/mayavi_workbench_application.py
index 4fef254cd..b0c927a68 100644
--- a/mayavi/plugins/mayavi_workbench_application.py
+++ b/mayavi/plugins/mayavi_workbench_application.py
@@ -16,7 +16,8 @@
 # Local imports.
 import mayavi.api
 from mayavi.preferences.api import preference_manager
-from mayavi.plugins._workbench_fixes import fix_view_chooser
+from mayavi.plugins._workbench_fixes import (fix_view_chooser,
+                                            restore_qfont_typewriter)
 
 IMG_DIR = dirname(mayavi.api.__file__)
 logger = logging.getLogger(__name__)
@@ -70,6 +71,7 @@ def run(self):
         logger.debug('---------- workbench application ----------')
 
         fix_view_chooser()
+        restore_qfont_typewriter()
 
         # Make sure the GUI has been created (so that, if required, the splash
         # screen is shown).
diff --git a/mayavi/tests/common.py b/mayavi/tests/common.py
index a6725f47e..cc03d0c2f 100644
--- a/mayavi/tests/common.py
+++ b/mayavi/tests/common.py
@@ -64,3 +64,107 @@ def get_example_data(fname):
     p = os.path.join('data', fname)
     return os.path.abspath(fixpath(p))
 
+
+# (action, message prefix, category) for running an example.  One inventory for
+# both places examples run: `run_example_headless` below applies it in Python,
+# and `scripts/render_docs.py` both applies it and carries it into the gallery
+# render's per-example children through `PYTHONWARNINGS`.  A filter whose
+# message begins with whitespace cannot go here -- `warnings._setoption` strips
+# the message `PYTHONWARNINGS` gives it, so it could never match in those
+# children; those live in `render_examples.UNSETTABLE_WARNING_FILTERS`.
+EXAMPLE_WARNING_FILTERS = (
+    ('error', '', Warning),
+    # unsatisfiable until pyface.workbench moves to apptools
+    ('ignore', 'Workbench will be moved from pyface', PendingDeprecationWarning),
+    # an example calling plt.show() is right; it is the renderer that has no
+    # interactive matplotlib backend
+    ('ignore', 'FigureCanvasAgg is non-interactive', UserWarning),
+    # tvtk_segmentation.py wants vtkImageThreshold, whose replacement
+    # vtkImageBinaryThreshold does not exist before VTK 9.7 -- see
+    # tvtk/WORKAROUNDS.md
+    ('ignore', 'Call to deprecated class vtkImageThreshold', DeprecationWarning),
+)
+
+
+def example_warning_filters():
+    """`EXAMPLE_WARNING_FILTERS`, plus the ones this VTK needs."""
+    filters = list(EXAMPLE_WARNING_FILTERS)
+    # VTK's own numpy_support.vtk_to_numpy assigns to .shape, which NumPy 2.5
+    # deprecated; fixed in 9.7, so keep it fatal there.  mayavi/tests/conftest.py
+    # carries the same gate for the suites -- see tvtk/WORKAROUNDS.md
+    from tvtk.common import vtk_major_version, vtk_minor_version
+    if (vtk_major_version, vtk_minor_version) < (9, 7):
+        filters.append(('ignore',
+                        'Setting the shape on a NumPy array has been deprecated',
+                        DeprecationWarning))
+    return filters
+
+
+# Examples that are meant for the mayavi2 application to import rather than to
+# be executed, and say so by exiting non-zero under `__main__`.  Their module
+# body is the part that does the work, so they get a name that skips the guard.
+RUN_AS_MODULE = ('user_mayavi', 'zzz_reader')
+
+
+def run_example_headless(filename):
+    """Run one example script to completion, with nothing left blocking.
+
+    An example ends by handing itself to an event loop -- ``mlab.show()``,
+    ``GUI.start_event_loop()``, ``configure_traits()``, VTK's own
+    ``vtkRenderWindowInteractor::Start`` -- which never returns.  Stub those
+    out and the whole script still runs, which is all this is checking: that
+    the example works against the installed VTK and ETS.
+
+    The gallery renderer in ``docs/source/render_examples.py`` does the same
+    for the examples it shoots a figure of, but with the capture machinery
+    wrapped around it; ``examples/test_examples.py`` calls this for the rest.
+    """
+    import re
+    import runpy
+    import sys
+    import warnings
+
+    from traits.api import push_exception_handler
+
+    # an example is expected to run warning-clean, as it is in the gallery
+    # render.  This is the only thing making them fatal here: pytest's
+    # filterwarnings applies to the process it runs in, not to this child.
+    for action, message, category in example_warning_filters():
+        warnings.filterwarnings(action, re.escape(message), category)
+    # as in the renderer: an exception in a notification handler is otherwise
+    # printed and swallowed, and the example "passes" with half its work undone
+    push_exception_handler(reraise_exceptions=True)
+    fail_instead_of_dialogs()
+    # an example that also draws with matplotlib would block in pyplot.show()
+    os.environ.setdefault('MPLBACKEND', 'Agg')
+
+    from pyface.api import GUI
+    from mayavi import mlab
+    from tvtk.api import tvtk
+    from tvtk.tools import visual
+
+    GUI.start_event_loop = lambda self: None
+    tvtk.RenderWindowInteractor.start = lambda self: None
+    visual.show = lambda: None
+    # mlab.show doubles as a decorator, and returning None from it would leave
+    # the example calling None() rather than its own function
+    mlab.show = lambda func=None, stop=False: func
+    HasTraits.configure_traits = \
+        lambda self, *args, **kwargs: self.edit_traits(kind='live')
+    try:
+        from pyface.qt import QtGui
+    except Exception:
+        pass        # a toolkit-less run has no loop to stop either
+    else:
+        for name in ('exec', 'exec_'):
+            if hasattr(QtGui.QApplication, name):
+                setattr(QtGui.QApplication, name, lambda *a, **kw: 0)
+
+    filename = os.path.abspath(filename)
+    # examples/mayavi/explorer names its own modules as envisage services, and
+    # resolving one is an import: give the example the sys.path[0] that running
+    # it as a script would have given it
+    sys.path.insert(0, os.path.dirname(filename))
+    name = os.path.splitext(os.path.basename(filename))[0]
+    runpy.run_path(filename,
+                   run_name=name if name in RUN_AS_MODULE else '__main__')
diff --git a/mayavi/tests/datasets.py b/mayavi/tests/datasets.py
index b6d735cac..cd019437c 100644
--- a/mayavi/tests/datasets.py
+++ b/mayavi/tests/datasets.py
@@ -97,19 +97,16 @@ def mixed_type_ug():
     cells = array([4, 0, 1, 2, 3, # tetra
                    8, 4, 5, 6, 7, 8, 9, 10, 11 # hex
                    ])
-    # The offsets for the cells, i.e. the indices where the cells
-    # start.
-    offset = array([0, 5])
     tetra_type = tvtk.Tetra().cell_type # VTK_TETRA == 10
     hex_type = tvtk.Hexahedron().cell_type # VTK_HEXAHEDRON == 12
     cell_types = array([tetra_type, hex_type])
     # Create the array of cells unambiguously.
     cell_array = tvtk.CellArray()
-    cell_array.set_cells(2, cells)
+    cell_array.import_legacy_format(cells)
     # Now create the UG.
     ug = tvtk.UnstructuredGrid(points=points)
     # Now just set the cell types and reuse the ug locations and cells.
-    ug.set_cells(cell_types, offset, cell_array)
+    ug.set_cells(cell_types, cell_array)
     return ug
 
 def generateStructuredGrid():
diff --git a/mayavi/tests/test_workbench_fixes.py b/mayavi/tests/test_workbench_fixes.py
index d61e22004..a1b0d2aeb 100644
--- a/mayavi/tests/test_workbench_fixes.py
+++ b/mayavi/tests/test_workbench_fixes.py
@@ -48,3 +48,27 @@ def test_view_chooser_dialog(node_class):
     # 'panel' rather than 'live': same editors, no window on screen
     ui = chooser.edit_traits(kind='panel')
     ui.dispose()
+
+
+@pytest.mark.skipif(ETSConfig.toolkit == 'null',
+                    reason='the shell needs a UI toolkit')
+def test_python_shell_builds():
+    """Test that pyface's Python shell can be built (gh-1409).
+
+    On PyQt6 it cannot without `restore_qfont_typewriter`, and this is what
+    catches the alias going missing again -- it already did once, having been
+    nested inside a `fix_python_shell_view` that envisage 8.0.1 retired.
+    """
+    from pyface.api import GUI, PythonShell
+    from pyface.qt import QtGui
+
+    from mayavi.plugins._workbench_fixes import restore_qfont_typewriter
+
+    restore_qfont_typewriter()
+    GUI()  # the toolkit application object the widget needs
+    shell = PythonShell(QtGui.QWidget())
+    shell.create()
+    try:
+        assert shell.control is not None
+    finally:
+        shell.destroy()
diff --git a/pyproject.toml b/pyproject.toml
index e3bfc916f..d5d6415d5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -62,6 +62,7 @@ test = [
     "pytest-timeout",
 ]
 docs = [
+    "coverage[toml]>=7.10",  # docs.yml measures the gallery render
     "docutils",     # mlab_reference.py validates docstrings with it directly
     "matplotlib",   # used by the mlab_3D_to_2D example
     "networkx",     # used by the delaunay_graph example
diff --git a/scripts/render_docs.py b/scripts/render_docs.py
index 140d11664..b50cea8d3 100644
--- a/scripts/render_docs.py
+++ b/scripts/render_docs.py
@@ -17,41 +17,21 @@
 REPO = Path(__file__).resolve().parent.parent
 SOURCE = REPO / 'docs' / 'source'
 
-# (action, message prefix, category) -- the examples and the generators run as
-# plain scripts, so this is the only thing making their warnings fatal; the
-# Makefiles' -W covers Sphinx's own diagnostics, not Python's.
-# Filters whose message begins with whitespace cannot go here -- PYTHONWARNINGS
-# carries this list into the children and warnings._setoption strips it.  Those
-# live in render_examples.UNSETTABLE_WARNING_FILTERS.
-WARNING_FILTERS = (
-    ('error', '', Warning),
-    # unsatisfiable until pyface.workbench moves to apptools
-    ('ignore', 'Workbench will be moved from pyface', PendingDeprecationWarning),
-    # an example calling plt.show() is right; it is this renderer that has no
-    # interactive matplotlib backend
-    ('ignore', 'FigureCanvasAgg is non-interactive', UserWarning),
-    # tvtk_segmentation.py wants vtkImageThreshold, whose replacement
-    # vtkImageBinaryThreshold does not exist before VTK 9.7 -- see
-    # tvtk/WORKAROUNDS.md
-    ('ignore', 'Call to deprecated class vtkImageThreshold', DeprecationWarning),
-)
-
 
 def apply_warning_filters():
     """Make warnings fatal, here and in the per-example child processes.
 
-    `capture_in_subprocess` discards a child's output unless it exits
-    non-zero, so a warning there is only ever seen by being raised.
+    The examples and the generators run as plain scripts, so this is the only
+    thing making their warnings fatal; the Makefiles' -W covers Sphinx's own
+    diagnostics, not Python's.  And `capture_in_subprocess` discards a child's
+    output unless it exits non-zero, so a warning there is only ever seen by
+    being raised.
+
+    The list itself is `mayavi.tests.common.EXAMPLE_WARNING_FILTERS`, shared
+    with `pytest examples`, which runs the examples this render does not.
     """
-    filters = list(WARNING_FILTERS)
-    # VTK's own numpy_support.vtk_to_numpy assigns to .shape, which NumPy 2.5
-    # deprecated; fixed in 9.7, so keep it fatal there.  mayavi/tests/conftest.py
-    # carries the same gate for the suites -- see tvtk/WORKAROUNDS.md
-    from tvtk.common import vtk_major_version, vtk_minor_version
-    if (vtk_major_version, vtk_minor_version) < (9, 7):
-        filters.append(('ignore',
-                        'Setting the shape on a NumPy array has been deprecated',
-                        DeprecationWarning))
+    from mayavi.tests.common import example_warning_filters
+    filters = example_warning_filters()
     for action, message, category in filters:
         warnings.filterwarnings(action, re.escape(message), category)
     # PYTHONWARNINGS matches the message as a literal prefix, not a regex
diff --git a/tvtk/WORKAROUNDS.md b/tvtk/WORKAROUNDS.md
index 771559748..e3d1a6ac0 100644
--- a/tvtk/WORKAROUNDS.md
+++ b/tvtk/WORKAROUNDS.md
@@ -285,12 +285,14 @@ Those obey the same marker and cull rules; they are keyed on `qVersion()` and
   Qt's own GL context instead of embedding a native X window.  Until tvtk
   can require and adopt that, this is in the never-expires class.
 
-## Outside the layers: pyface
+## Outside the layers: pyface and traitsui
 
 Mayavi is the last consumer of `pyface.workbench`, which upstream considers
-unmaintained, so bugs there are ours to carry.  These are keyed on a pyface
-release rather than a VTK version, and cull when `setup.py`'s `pyface` floor
-passes the release that carries the upstream fix.  Current case:
+unmaintained, so bugs there are ours to carry — as are the ones in the Qt
+backends of pyface and traitsui that only our windows reach.  These are keyed
+on a pyface or traitsui release rather than a VTK version, and cull when
+`setup.py`'s floor passes the release that carries the upstream fix.  Current
+cases:
 
 - `mayavi/plugins/_workbench_fixes.py`: pyface's "View -> Other..." dialog
   adapts by *calling* the interface (`IView(obj, Undefined)` in
@@ -314,9 +316,48 @@ passes the release that carries the upstream fix.  Current case:
   per-example children through `PYTHONWARNINGS`, and `warnings._setoption`
   strips the message it is given, so a message starting with a newline — as
   PySide6's does — can never be matched there.
-- `mayavi/tests/conftest.py` ignores pyface's "Workbench will be moved from
-  pyface" `PendingDeprecationWarning`.  Unsatisfiable rather than deferred:
-  there is nowhere for the import to move to until the code does.
+- `mayavi/tests/conftest.py`, `tvtk/tests/conftest.py` and
+  `mayavi/tests/common.py`'s `EXAMPLE_WARNING_FILTERS` ignore pyface's
+  "Workbench will be moved from pyface" `PendingDeprecationWarning`.
+  Unsatisfiable rather than deferred: there is nowhere for the import to move
+  to until the code does.  `tvtk`'s copy is for `test_browser.py`, which builds
+  the workbench view wrapping `PipelineBrowser`; the examples' is for the four
+  that stand the workbench up (`explorer3d`, `nongui`, `plugins/test`,
+  `subclassing_mayavi_application`).
+
+- `mayavi/plugins/_workbench_fixes.py`: `restore_qfont_typewriter()` puts back
+  `QFont.TypeWriter`, which PyQt6 dropped along with the rest of the unscoped
+  enums but pyface still names in its console widget, its code editor and its
+  font registry.  Building the Python shell view therefore raises
+  `AttributeError: type object 'QFont' has no attribute 'TypeWriter'` on PyQt6;
+  the one alias covers every call site, and
+  `mayavi_workbench_application.run()` applies it beside `fix_view_chooser()`.
+  Keyed on pyface, not on PyQt6 — the bindings are not going back.  It was lost
+  once already, having been nested inside a `fix_python_shell_view` that
+  envisage 8.0.1 made unnecessary; `mayavi/tests/test_workbench_fixes.py`
+  now builds a shell so that cannot happen quietly again.
+- `tvtk/tests/test_ivtk.py` skips its whole class on PyQt6.  Three independent
+  upstream bugs, all of which `ivtk.viewer()` and every `IVTK*` window walk
+  straight into there, and none of which tvtk can paper over:
+  - `pyface.ui.qt.action.action_item._MenuItem` calls
+    `QMenu.addAction(text, slot, shortcut)`.  PyQt6 has no such overload — its
+    three-argument forms are `(text, slot, type)` and `(text, shortcut, slot)`
+    — so building the menu bar raises `TypeError: arguments did not match any
+    overloaded call`.  PySide6 accepts it.
+  - the same `QFont.TypeWriter` the entry above restores, which the two
+    `WithCrust` windows reach through pyface's console widget.  Nothing applies
+    that alias on a tvtk-only path, and fixing just this one would not make the
+    windows work while the other two stand, so it is left to the skip.
+  - `traitsui.qt.ui_panel._GroupSplitter._resize_items` seeds its sizes from
+    `Item.width`, a `Float`, and returns early on `if avail <= 0` before
+    anything is coerced, so a splitter that is still zero-sized reaches
+    `QSplitter.setSizes([-1.0, -1.0])`.  PyQt6 raises `TypeError: index 0 has
+    type 'float' but 'int' is expected`; because it happens inside a
+    `showEvent`, the exception is unraisable and Qt **aborts the process**
+    (exit 134), which no skip inside the test could have caught.
+  Both reproduce against pyface and traitsui `main` (checked 2026-08-19), so
+  the skip cannot be keyed on a release yet.  The PySide6 and PyQt5 rows keep
+  covering what the tests are for; drop the skip once both are fixed upstream.
 
 ## Outside the layers: `mayavi/`
 
@@ -330,13 +371,14 @@ and should go.  Current case:
   `numpy_support.vtk_to_numpy` still assigns to `.shape`.  9.7 fixed it, so
   the filter is version-keyed rather than blanket — mayavi's own assignments
   all went through `tvtk.common.reshape_view` instead, and must stay errors.
-- `scripts/render_docs.py` ignores VTK 9.7's "Call to deprecated class
-  vtkImageThreshold" for the example render, where warnings are fatal.
-  `tvtk_segmentation.py` needs that filter and cannot move to the replacement
-  `vtkImageBinaryThreshold`, which does not exist before 9.7; at a 9.7 floor
-  switch the example over and drop the filter.  The suites need no such entry:
-  `tvtk/tests/conftest.py` already ignores every "Call to deprecated" message,
-  since they instantiate every VTK class.
+- `mayavi/tests/common.py`'s `EXAMPLE_WARNING_FILTERS` ignores VTK 9.7's "Call
+  to deprecated class vtkImageThreshold" wherever an example runs with warnings
+  fatal — `scripts/render_docs.py` for the gallery, `run_example_headless` for
+  the rest.  `tvtk_segmentation.py` needs that filter and cannot move to the
+  replacement `vtkImageBinaryThreshold`, which does not exist before 9.7; at a
+  9.7 floor switch the example over and drop the filter.  The suites need no
+  such entry: `tvtk/tests/conftest.py` already ignores every "Call to
+  deprecated" message, since they instantiate every VTK class.
 - `mayavi/core/utils.py` reduces composite arrays with `numpy` rather than
   `numpy_interface.algorithms` when the runtime VTK dispatches numpy functions
   on them (detected by `dsa.COMPOSITE_OVERRIDE`, added in 9.6 along with the
diff --git a/tvtk/plugins/browser/browser_view.py b/tvtk/plugins/browser/browser_view.py
index aeb8e165b..a148273bc 100644
--- a/tvtk/plugins/browser/browser_view.py
+++ b/tvtk/plugins/browser/browser_view.py
@@ -47,7 +47,8 @@ def create_control(self, parent):
         self.browser = PipelineBrowser()
         self.browser.show(parent=parent)
 
-        return self.browser.ui.control
+        # PipelineBrowser keeps its UI in _ui; there is no public `ui`
+        return self.browser._ui.control
 
     ###########################################################################
     # Private interface.
@@ -64,6 +65,10 @@ def _on_scenes_changed(self, event):
 
         """
 
+        # TODO: both of these are no-ops -- map() is lazy in Python 3 and
+        # nothing consumes it, so the browser has never tracked scenes being
+        # added or removed.  No example or test exercises this path.
+
         # Scenes that were removed.
         map(self._remove_scene, event.removed)
 
diff --git a/tvtk/pyface/ui/qt4/actor_editor.py b/tvtk/pyface/ui/qt4/actor_editor.py
index f4ad62679..c09c491cc 100644
--- a/tvtk/pyface/ui/qt4/actor_editor.py
+++ b/tvtk/pyface/ui/qt4/actor_editor.py
@@ -13,9 +13,9 @@
 # Enthought library imports.
 from traits.api import Any, Bool, Callable, Dict, Str
 try:
-    from traitsui.qt4.editor import Editor
-except ModuleNotFoundError:
     from traitsui.qt.editor import Editor
+except ModuleNotFoundError:  # traitsui < 8
+    from traitsui.qt4.editor import Editor
 from traitsui.basic_editor_factory import BasicEditorFactory
 
 from .decorated_scene import DecoratedScene
diff --git a/tvtk/tests/conftest.py b/tvtk/tests/conftest.py
index 1ea968697..f57c0ada6 100644
--- a/tvtk/tests/conftest.py
+++ b/tvtk/tests/conftest.py
@@ -11,6 +11,8 @@
 # these tests instantiate every VTK class and read every getter, deprecated
 # ones included; the parenthetical wording varies far too much to match on
 ignore:Call to deprecated .*Deprecated since version.*:DeprecationWarning
+# unsatisfiable until pyface.workbench moves -- see tvtk/WORKAROUNDS.md
+ignore:Workbench will be moved from pyface:PendingDeprecationWarning
 # should be fixed in traits
 ignore: module 'sre_.+' is deprecated:DeprecationWarning
 """
diff --git a/tvtk/tests/test_browser.py b/tvtk/tests/test_browser.py
index 9ebcda556..634ceaf9d 100644
--- a/tvtk/tests/test_browser.py
+++ b/tvtk/tests/test_browser.py
@@ -179,3 +179,25 @@ def callback():
 
         # Then
         self.assertTrue(self.count > 0)
+
+
+class TestBrowserView(unittest.TestCase):
+    """The workbench view wrapping a PipelineBrowser."""
+
+    def test_create_control(self):
+        # it reached for a `ui` attribute PipelineBrowser does not have, and
+        # the workbench answers a failing view with a message box rather than
+        # an exception -- so the mayavi2 pipeline browser view just never
+        # opened.  See examples/tvtk/plugins/test.py.
+        try:
+            from pyface.qt import QtGui
+        except (ImportError, RuntimeError):
+            self.skipTest('Qt is not available.')
+        from pyface.api import GUI
+        from tvtk.plugins.browser.browser_view import BrowserView
+
+        GUI()   # the view needs a QApplication to build against
+        parent = QtGui.QWidget()
+        control = BrowserView().create_control(parent)
+
+        self.assertIsNotNone(control)
diff --git a/tvtk/tests/test_ivtk.py b/tvtk/tests/test_ivtk.py
new file mode 100644
index 000000000..c7d24ba3d
--- /dev/null
+++ b/tvtk/tests/test_ivtk.py
@@ -0,0 +1,69 @@
+"""The ivtk viewer windows."""
+# Copyright (c) Enthought, Inc.
+# License: BSD Style.
+
+import unittest
+
+try:
+    from pyface.api import GUI
+    from pyface.qt import QtGui, qt_api
+except (ImportError, RuntimeError):
+    # no binding installed, or QT_API set but empty, as on the headless CI row
+    GUI = QtGui = qt_api = None
+
+
+# Three separate upstream bugs bite here on PyQt6, none of them ours and the
+# last not even catchable -- see tvtk/WORKAROUNDS.md.  pyface's `_MenuItem`
+# calls `QMenu.addAction(text, slot, shortcut)`, an overload PyQt6 does not
+# have, so every one of these windows fails building its menu bar; pyface's
+# console widget names the `QFont.TypeWriter` PyQt6 dropped, which the two
+# `WithCrust` windows hit (mayavi2 itself is covered by
+# `_workbench_fixes.restore_qfont_typewriter`, but nothing applies it on this
+# tvtk-only path); and traitsui's `_GroupSplitter._resize_items` hands
+# `QSplitter.setSizes` the floats it seeded from `Item.width` whenever the
+# splitter is still zero-sized, which PyQt6 rejects from inside a `showEvent`,
+# where the TypeError is unraisable and Qt aborts the process.  PySide6 has the
+# overload, has the alias and coerces the floats, so the rest of the matrix
+# covers what these are here for.  All three reproduce on pyface and traitsui
+# `main` as of 2026-08-19.
+@unittest.skipIf(QtGui is None, 'Qt is not available.')
+@unittest.skipIf(qt_api == 'pyqt6',
+                 'pyface and traitsui break the ivtk windows on PyQt6')
+class TestIVTKWindows(unittest.TestCase):
+    """Each of the four windows builds, all the way down to its control.
+
+    pyface 8 stopped creating a widget's control from its constructor, which
+    left the ones built here handing a None to QSplitter.addWidget -- a
+    segfault, not an exception, and so invisible to anything short of running
+    the window.  See examples/tvtk/ivtk_example.py.
+    """
+
+    def setUp(self):
+        from tvtk.tools import ivtk
+        self.ivtk = ivtk
+        GUI()   # the windows need a QApplication to build against
+
+    def _check(self, name):
+        from tvtk.pyface import actors
+
+        window = getattr(self.ivtk, name)(size=(300, 200))
+        try:
+            window.open()
+            self.assertIsNotNone(window.control, name)
+            self.assertIsNotNone(window.scene, name)
+            window.scene.add_actors(actors.cone_actor())
+            window.scene.reset_zoom()
+        finally:
+            window.close()
+
+    def test_ivtk(self):
+        self._check('IVTK')
+
+    def test_ivtk_with_crust(self):
+        self._check('IVTKWithCrust')
+
+    def test_ivtk_with_browser(self):
+        self._check('IVTKWithBrowser')
+
+    def test_ivtk_with_crust_and_browser(self):
+        self._check('IVTKWithCrustAndBrowser')
diff --git a/tvtk/tools/ivtk.py b/tvtk/tools/ivtk.py
index 94621e457..92cb0babf 100755
--- a/tvtk/tools/ivtk.py
+++ b/tvtk/tools/ivtk.py
@@ -280,6 +280,7 @@ def _create_rhs(self, parent):
         style.  's' and 'scene' are bound to the Scene instance."""
 
         self.python_shell = PythonShell(parent)
+        self.python_shell.create()
         self.python_shell.bind('scene', self.scene)
         self.python_shell.bind('s', self.scene)
         self.python_shell.bind('tvtk', tvtk)
@@ -342,6 +343,7 @@ def close(self):
     def _create_lhs(self, parent):
         """ Creates the left hand side or top depending on the style. """
         self.browser_scene = SceneWithBrowser(parent)
+        self.browser_scene.create()
         self.scene = self.browser_scene.scene
         self.browser = self.browser_scene.browser
         return self.browser_scene.control
@@ -351,6 +353,7 @@ def _create_rhs(self, parent):
         style.  's' and 'scene' are bound to the Scene instance."""
 
         self.python_shell = PythonShell(parent)
+        self.python_shell.create()
         self.python_shell.bind('scene', self.scene)
         self.python_shell.bind('s', self.scene)
         self.python_shell.bind('browser', self.browser)
@@ -454,6 +457,7 @@ def _create_contents(self, parent):
         """ Create the contents of the window. """
 
         self.browser_scene = SceneWithBrowser(parent)
+        self.browser_scene.create()
         self.scene = self.browser_scene.scene
         self.browser = self.browser_scene.browser
         return self.browser_scene.control