I have the same issue as barguy.
WHY DID I LOSE MY ENTIRE PROGRESS?!
I lost my campaign progress, avatar stuff, loadouts, armor and it even reset my settings so now im not inverted. Why did this happen? There is no resolve, im convinced.
It saves when you turn on halo, soooo boom, it saves over your original save.
Guess I wont be playing this game ever again. I lost my entire progress!
Im so angry. Ive bought every halo and love this franchise, but this makes me no longer want to participate. So, 343, how did you manage to screw this one up?! Ready for the hate wave of fans who lost all of their progress? Im very sad and angry.