I have just finished the side quest in Vahlok's tomb and it appears that Solstheim won't load up. I have restarted the system and the game, and I unfortunately don't have a save prior to the dungeon. My Xbox doesn't freeze when this happens; I can access the Xbox menu, the loading screen is still animated and the audio still plays. I know normally xbox loading times can be a bit ridiculous, but on my third try after restarting the whole system I waited so long that the game darkened into "sleep mode." It won't be a crisis if this is game-breaking as I typically do a speed run through first, but any fixes or suggestions would be very welcome.
Edit: I should mention that the game is downloaded onto my hard drive.