login greeter won't let me login...

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http://forums.fedoraforum.org – Hi, This afternoon I was working in Fedora 19 and suddenly the login greeter popped up ( with a black background ). When I enter my password, the screen darkens and then the greeter reappears. I *can* login as root and get the gnome 3 'expeience'. I can login to my account via ssh from other machines. Something is evidently corrupted and causes my login to fail (but root works!) Any suggestions? Jerry (HowTos)