Definitely happens if you are cheesing the door area. If you drop Saren while you're still inside the Krogan breeding area, rather than out in the boss arena next to the nuke, then the game won't know where to put you after the cut scene. You'll end up splashing around in the dark. You have to beat it again (sorry) you can still cheese it with the door, but your last hit on Saren you need to be out in the open.
This is an old thread that's been inactive for almost 5 years, I am going to lock it to prevent necro-posting.
Feel free to create a new thread if you have a question.
