Hi @Milan Straub - sorry for the trouble. Is this happening to you anywhere you work in Figma?
Are you not able to use the commands on any files, or does it seem to be only one file it doesn’t work on?
Is it in both web and desktop app?
Can you try shutting down your computer, rebooting, and trying again?
I went into Figma to see if the undo shortcut was broken for me, and it works as expected. I’m wondering if a quick reboot will get this working for you again.
Let me know if you still run into issues after trying that.