I have 2 monitors I use to work in extended mode: the Wacom Cintiq 12wx (1200*800 px) I use to draw and a 27" Asus (1920*1080 px). Recently, I noticed that with the latest 3.0 Beta, in my Asus monitor only, when I am in "full screen mode" and I switch with Alt+tab to another programm and go back to Krita, then the toolbar's buttons (File - Edit - View - Image ......) are frozen: clicking on them don't do anything. Reproducible: Always
This is actually a Qt bug, I think. If you disable opengl, it works again. I've had to disable full screen mode on windows for now :-(
We now hack around this issue.