User blog comment:Jamyz/Myths and mavericks DLC review/@comment-3563546-20110925174623/@comment-3455248-20110927140148

Are you talking about Undead Nightmare or Undead Overrun? The Undead Overrun change was not part of Myths and Mavericks, it was part of Title Update 1.07. And, yes, it was glitchy, at least on PS3, ranging from minor weirdness to full crashes. I haven't played that mode since the first day after the change, so I don't know if it's been fixed yet.