I was around halfway or so through chapter 4 (on the 360), with no problems so far. Booted it up last night, resumed my save as normal. Then...chapter 1 started playing? "Huh, weird" I thought. Exited out, went to resume again and...my save had reset to the beginning of the first chapter. Hadn't even thought about saving in multiple slots or anything. UGH.
I'm pretty sure I'm just boned, but is there any chance I might not be? Someone say otherwise! God dammit.