I saw some odd agro srtuff last night in HPoS, then the world server crapped out, and magically the instance mobs starting behaving normally. I guess the mobs get easily pissed off when there are too many people playing the game? Which is odd becuase server lag never seemed to influence odd instance mob interaction (except lag spikes in ToC) but it seems more widespread with the cross realm dungeons, oh wait did I just suggest that Blizzard introduced something that was not load tested propoerly before going into production? Nah that never happens... I will say that if your lucky enough to have a world server crash on you while your in an instance its a great thing with the insta-port LFD tool!