#1 - March 24, 2011, 2:08 a.m.
Blizzard Post
Due to a fix applied earlier today a bug was introduced that is causing bosses which have any ‘fixate’ abilities, meaning those that will fixate on and/or chase a certain player, to not function correctly. This is currently noticeable for most players on Atramedes in normal or heroic, and Ascendant Council and Sinestra on heroic, but affects a great number of other bosses throughout the game.

We have a fix currently in the testing stages but it will require realm restarts to apply. We’re currently anticipating rolling restarts to happen early tomorrow morning during off-peak hours. We apologize for any inconvenience for those attempting bosses tonight with these mechanics.