I'm just gonna describe what happened exactly. I forget the name of the level, but you start off having to escort tanks through some streets. You eventually have to get into one of the tanks guns for this on rails part, and wind up going in a parking garage area. When you get to the part where a cutscene kicks in and you fall through the floor, then a car comes down on you, my game locked up. I thought, "No bid deal...happens fairly often on some Xbox games." I turned the system off, then back on. Loaded the game expecting to be at the checkpoint that was right before that cutscene, but I'm not.....I have to do the whole level over. The checkpoints and even my total playtime was all reset to what it was when I quit playing last night.
Just figured I would post about it to see if others had something similar and to let people know about it. I was playing on Veteran too.....I'm debating whether or not I should just put it down to normal/hard and finish it up or try again on veteran.