A 21 page thread on the game’s official forums is full of users complaining about save file issues with some believing that the Catwoman DLC is the reason behind the problems. Warner Bros. has announced that they are currently working on a fix for the issue but could not offer an ETA at this point.
EGM’s TAKE: Losing hours of progress through no fault of your own is never a good thing, and Warner Bros. had better find a fix quickly if they don’t want people rioting.
Have you encountered the bug? Leave a comment below.
Source: Arkham City Forums