All windows in my Qubes 4.1.2 system (Qube Manager, updates, individual Qube windows) all launch and are stuck to the upper left corner of the screen (drawn on top of the application menu Q) and cannot be moved nor resized. Fast window switching (alt-tab) and other keyboard shortcuts also no longer work.
This error has now occurred on multiple machines with integrated video adapters (a Q270-based desktop and two different Lenovo c. 2020/2021 Thinkpads) for unknown reasons (not immediately following a kernel or other Dom0 upgrade) apparently randomly, and (in my hands) irreversibly.
Any troubleshooting suggestions? I can’t seem to find any reference to this issue anywhere.