So I finally read this thread since I've finished it and only just saw Gamma's post that he's already had the problem. I find it strange that it's managed to sort itself out somehow. Everytime I boot the game I have to hit the guide button (this unlocks the game strangely enough), then go Exit Game, say yes to 'go to sign in screen', then voila, it's in my saved game. Annoying, but not too bad. Definitely a playable game again.
I laughed at the notion that this game is only around an hour long. You could finish it in around an hour on first go if you're either an incredible person or you're playing the game with a group of people. These sorts of games are much harder (and more rewarding) when you play by yourself. And then once you find the puzzle pieces you've got the stars (which I only know of one, although there's areas which haven't made much sense but I've been too concerned with puzzle pieces) and the speed runs (just completed my third speed run challenge). So much more than an hour's worth. Such a fucking good game.
Braid and Limbo make me want to do the