Problem:
After locking Vista some letters on my keyboard act as hotkeys. U (which is in my password) brings up the “Ease of Access” window. Needless to say, this makes the login process impossible to complete.

Cause:
This only happens if I run Virtual PC (2007) when locking Vista. So I guess VPC is to blame, but I’m sure there are other programs out there that might cause this behaviour too…

Solution:
Quite simple really. Click the “Switch user” button and select your own account. Hotkeys are gone!