Gotham City Impostors might not have gone through quite the same ruthless training and disciplined regimen that Bruce Wayne did before he became Batman. An admin on the game's official forums recently posted about a potential glitch in the game that resets earned stats and unlocked content, and that thread has earned itself a whopping 63 pages of irate customers on both Xbox 360 and the PlayStation 3. Just losing your stats in the game is a waste of time, but some of those customers bought and paid money for XP boosts and other items to help them level up, which means they're losing that money as well.
Another official forum post suggests that the problem arises when the trial version of the game is converted into the full version. We've contacted WBIE for more information on the glitch. If you're thinking about unlocking the full game or have a lot of stats saved up already, you might want to step gingerly until a fix is out.
[Thanks to everyone who sent this in!]