Yeah, I eventually got mine to go through. Allthough the first few that "went through" actually didn't go through at all but were double-spends by gox (see thread on this elsewhere). I strongly suspect that the theory that this happens when gox's hotwallet is empty is spot-on. This happens whenever the gap between gox price and stamp price is narrower than usual. You get a run on withdrawals at gox which results in an empty hot wallet. Count on this taking ~2-3 days to resolve.