Well, for as good of a game as it is, Castle Crashers has one glaring flaw: you can lose ALL of your progress. This occurs when you play the game on multiple consoles, and when you load the 2nd console you find your characters aren’t there. Loading the game up and exiting will then Save, wiping out any chance of getting them back. Since this game is mostly about collecting characters, weapons, and animals, this is a huge deal. Odd problem to have, since it is apparently all stored via your Gamertag (ala Halo 3, Gears of War, and Alien Hominid).
Also, it only happens under certain (unknown) circumstances. Possibly tied to owning Alien Hominid HD in various states (trial, full, full but not original xbox, own full but not downloaded on current Xbox).
And this isn’t just a rumor: It happened to me :(
But, there are apparently a couple of workarounds…