Something else then …
I’ve had this happening over a longer time but since I just installed the latest display drivers and you have fixed everything else I thought I’d mention it now.
Often when I select something in one view, the other 3 views are not updated showing the selection. I only looked a bit more detailed into this phenomenon today and it seems that selecting in a perspective view gets updated in the orthographic views but not the other way around.
Selecting box and dim in the TOP view:
Selecting the same in the PERSPECTIVE view:
In the past I’ve also had issues with using ZSA not updating in the other viewports than the one that was active when called - I’ll report that if it happens again.