So my data went yesterday, right back to Level 1 across the board, not that I had any major levelled characters, a couple in the 20s and my orange knight was 37. Still very frustrating.
Anyway I made the fatal mistake of taking my HDD round to a friends. He doesn't have his box constantly connected to Live so when I first booted up, Castle Crashers was only showing as a trial game option, not sure if this might have had an effect at corrupting the data though I didn't load the game. Once we hooked into Live I started up the game and saw that my save game file was hooped. We carried on playing as all 4 of started at level 1 anyway and played for a few hours.
Later I popped on this forum and saw the handily stickied guide (thanks) realised my error by moving the drive, slapped forehead, but then tried some of the fixes since I was back at home. Unfortunately for me none of them worked, but I wonder whether that is because I had played some on my account which had then permanently written over the lost save, had I done the sign-out-sign-in trick first I may have been ok.
Just a thought, if anyone has these problems, try to fix it right away and don't play on!!
Zune profile: Hobbess254