you have to re-patch the game... run your client again or w/e... i had this problem, it's great when you fix it... but it can happen again. don't know why GM's are so elusive about this... thought this problem would've been fixed by now as i had this problem uh... like 6 months ago and people had it even before i started playing although no one would ever state a solution. Re-patching will do the trick, good luck. (time consuming, might have to do it more than once

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