It seem that new version of vtk(vtk==9.2) crashes with pyqt5.

[demul]

It seem that new version of vtk(vtk==9.2) crashes with pyqt5.
I have usually run the visualization script(multical vis) on Docker container and have never experienced any problem on that environment.
But recently, when I made new Docker image to update multical for my custom update on multical, the visualization script(multical vis) crashed.

So I carefully went over the version difference between the previous images and the new image, and finally figured out that the new version of vtk(vtk==9.2) is the problem!
Downgrading vtk to 9.1.0 solves the visualization crash!

[oliver-batchelor]

Thanks for this - I'll have a look and put some upper version bounds on if that helps!