Ok, I've seen people had issues with the Darkbrotherhood, but only after completing certain quests, i have an issue where i get an infinite loading screen, weird thing is:

• I disabled quick saves(this did improve the time way the OTHER loading screens had)
  
• I emptied my hard drive thing( have over 100 free space [yes i have an extra memory ps3 and dont have a lot of games])
  
• I can try and enter when i just start the game and i still get infinite loading time (got out of helgen and did the joining dark brotherhood quests and nothing)
  
• Happens in all my saves and is independent of my quests(can try it at the beggining or the end and still...)
  
• Had it since before patch 1.5

It's frustrating because i kill/obey Astrid and independently of the quest i get (destroy/join the darkbrotherhood) i try to enter the sanctuary and i get infinite loading time, like i already said, i have it since i play the game, doesnt matter when i try to enter (progression wise) or if i disabled quicksaves...
I've made 2 games, 1 where i tried to destroy the DB and i was lv 40 something and a new one where i want to join but i have the same issue (lv 20).

I think i explained pretty clear, if not i can give details, btw this is my first post here, i know its kind of complaint-ish, but i was looking for solutions online and didn't find anything like this. Oh, and skyrim is a great game, a lovely introduction for me in TES universe.