The funky messed up UI is caused by the error message being sent to the browser; once the underlying fault is fixed, it'll go away.
Do you have any plugins/products installed? Can you post the exact steps you take to do the action that causes this + any interesting setup options you have. (eg different date/time format, different language, different local?)
If you do have plugins/products installed, can you duplicate the error with them disabled?
If so, report it to the vbulletin.com bug tracker. If not reenable plugins/products 1 by 1 till you can reproduce the error. Report it the the writer of the plugin that caused the issue (eg the last one you enabled)
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