Vizinput intermittend failure

[BezierSpline]

Hello!
We have been having some strange errors with vizinput:
The usual vizinput directory or file dialog sometimes appear to be completely broken. There does not seem to be an obvious cause for this and it occurs randomly.
See attached image for the directory prompt in the broken state. The buttons also no longer function.
Usually this also comes with a perfomance drop for the rest of the script.

The only theory so far, is that the Vizard process does not terminate correctly and any subsequent execution of the program breaks the functionality.

We do not get any error message or warning with this error.

Has anyone encountered this?

Best wishes