Mists Of Pandaria Quest broken?
Have you tried a full reset UI? If relogging didn't help - that would be my next suggestion.
The simplest instructions for that is to move, rename or delete your WTF, Cache and Interface folders, and I personally recommend rebooting as well.
If that doesn't help - please do let us know. I am going to lock this thread now due to age, but feel free to start another if you still have questions.
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