Since I installed KB5024670 and KB5023706 on 2023-03-15 and restarted the system,
I realized that some "overlays" are not showing up anymore:
desktop switcher (Win+Tab)
switching desktops using Ctrl+Win+left/right still works
but its not possible to see all desktops and move windows around
sound volume (when changing volume using special keyboard keys, including mute)
changing the volume still works, but there is no visual feedback anymore
display brightness (using special keyboard keys)
Task View (icon on taskbar)
What is still working:
Project overlay (Win+p)
Sidenote: I have https://github.com/valinet/ExplorerPatcher installed.
Had a quick look into the Windows Logs ( Event Viewer), but found nothing suspicious.
Are there any hints where to have a look and how to fix this?