I'm sorry to tell you, but if it is working on another user account - it is something wrong with you current user account, not with AM.
I had that problem once (with other software) - and only deleting my account and creating it from scratch helped.
As last resort you can try free Onyx app (
www.titanium.free.fr) to fix your account - you can purge various caches and run maintenance scripts.
It is pretty safe procedure - but back up your computer first, just in case.