Lionhead has set-up a reporting page - just describe your issue, what Xbox console you're using and all details relating to your problem.
The testing and development teams review the blog and are working to releasa a patch soon.
The blog says: "There is no ETA on this, seeing as the process of game development is a slow, long and lonely one, so please bear with us. I hope to be able to update you in the near future."
Lionhead advise gamers to start a new game if experience a corrupt save game.
Voice talents in the game include Stephen Fry, Michael Fassbender and Simon Pegg.
If you want to know how to enter all six Demon Doors in Fable 3 read this post on gamezplay (contains spoilers)