The user profile is unique to every machine that someone logs into. The account and profile are two different things: the user account is the AD object, the user profile is the user's logon for that specific machine, namely their entry in C:\Users|%username%. I've seen plenty of instances where a local profile just decides to break for no logical reason. Delete the profile, have the user log into create a new one on the machine, and usually everything works again.
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