xev output if i presses Alt+F5:
KeyRelease event, serial 28, synthetic NO, window 0x1400001, root 0x3a, subw 0x0, time 35891765, (114,72), root:(180,93), state 0x18, keycode 64 (keysym 0xffe9, Alt_L), same_screen YES, XLookupString gives 0 bytes:
Argh. NumLock is on. This unfortunatly breaks things.
Super that was it. Thank you.
Frank