Polytron released a patch today for Fez, which is said to fix many save corrupting files and game crashing/breaking bugs. However, the team has noted a major flaw in that installing the patch is leading to corrupted saves.

From Polytron's blog: "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."

Good luck to Renaud Bédard and Phil Fish for a speedy fix and to all those who brave the patch.