I'm playing the XBox version of KOTOR and when I get to Yavin I can enter use all the access panels to get to the final room with the merchant, but when I get there it's a black screen. The dialogue appears on the screen as if I just lost a game of Pazaak to him and I can ask him questions and buy his items, but all against a black screen. When I turn around to try to get back to the Ebon Hawk it's all black as well.
I tried loading an earlier save and had the same result. I've already been through the game (it's been a while) and didn't have any problems with it before. Any ideas?