Braid is brilliant (and we do) no game is too angelic to escape our probing eye. We dig deep to find the real dirt that the big boys don't want you to know about, like bugs. We've used our investigative skills to find out about two from a secret source who ... oh, who are we kidding? They came from Jonathan Blow, the guy who created the game.
The bugs are a bit too specific to fully explain here, suffice it to say that if they hit you it's going to mean a fair amount of backtracking. They don't seem to be especially common, but they're serious for those who've been afflicted. The good news? While Jonathan Blow is spilling the beans he's also working with Microsoft on solutions.
Update: Blow's posted a few temporary fixes for one of the bugs.