While running HoF today with my guild, we encountered a strange bug on the first boss on our 3rd attempt. As we got him onto the third platform, he used his convert to mind control two people. Needless to say, it was a wipe so we were expecting to come back in and give it another go. However, the hunter who was mind controlled was never released from the mind control, and so he was stuck like that until he closed down WoW from the task manager.
This seems like a rare bug, but I figured it's worth pointing out. If anyone else has experienced this, let me know. I found it to be quite strange.