Keyboard Shortcuts not working

My Keyboard-Shortcuts are not working any more.
Or better, just the last change one is working.
E.g. CTRL+Q is working, CTRL+U is not working.
Deleting CTRL+U in the setting and setting it up again:
CTRL+U is working CTRL+Q is not working.

Hello, could you please let us know which version of eM Client you’re using (Menu > Help > About) and also which operating system and version you’re running?