I'm level 51,Redguard, attempting to complete the Companions quest, Trouble in Skyrim, Kill the leader at Ansilvund. I get to the area where the Nordic pillar puzzle is to get to the Ansilvund Burial Chambers, correctly solve the puzzle, open the gate, then nothing. The black screen appears with the billowing fog floating, unable to do anything except use the joysticks to move the fog around, no other controls work. I end up having to force shut down, turn the PS3 on again, reload an earlier save, attempt to get a different location for this quest, always get Ansilvund with the same results. Definition of insanity, doing the same thing and hoping for a different outcome. Is this a bug? Do I have to start over? Please tell me that I don't.

It's not the quest thats bugged as it's a Radiant Quest/Randomised location, but it's still Trouble in your Skyrim :<
Sounds like an infinite loading screen bug instead. There are different solutions for this. For example Disable AutoSave on Travel if it's switched on. Would be a starting point.

Thank you, will try this