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[MonsterTy]

Do you have a modchip installed? Specifically a Matrix or Chameleon?  If not then this post really doesn't belong here.  I'm probably wrong as you didn't go into much detail about your setup, but it sounds like you may have had an older softmod that was overwritten by the XBL update.  I have no problem with trying to help you solve your problem if you have net yet done so, but I will need more information on your XBox setup.