XBLA indie darling Fez just got an update today, but that update can totally corrupt your save file for the game.
This is an unfortunate bug to the update, especially given that part of what this update was released to fix was save file issues. Whoops. Here’s the announcement, straight from developer Polytron:
UPDATE : BAD NEWS EVERYONE.
There is an issue that seems fairly widespread where the save file can be seen as corrupted by the game after installing the patch. We’re floored that this wasn’t found in testing.
For the moment, deleting your system cache should resolve the issue, but if that fails, there is no known workaround.
We’ll keep you updated on the situation.
So, if you’ve updated your copy of Fez, then you might want to avoid playing the game until the next update can come along.