Sadly, I can no longer complete this great steaming pile of turd as my save has corrupted. If your game crashes while loading up a new chapter, you are probably screwed. I've tried loading from the disc, from install, on 3 different xboxes, the works, and I cannot progress now as the game will not load Chapt 4 mission 4.
With the multitude of other bugs I experienced in this game, I really do recommend avoiding it or at the very least, back your save up all the time. I now have to sit with this stinking turkey on my gamercard completely unfinished and that really pisses me off
Hope nobody else runs into this problem.