Please be more specific if you want answers. What were you doing when it froze? Have you been able to get it unfrozen for a bit before it freezes? Have you tried restarting?
Good luck, but you have to be more specific if you want people answering you.
This has happened to me once before, I logged off, logged back on again and it's never happened since. I think I was dragging items in and out of the menu bar, I confused it a bit.
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