I said this in another thread, but I have a bad feeling that the people at Gox have been using user's funds for themselves and only processing withdraws when there are sufficient new deposits. It was working before because such huge sums of money kept getting deposited, but its starting to pile up. Seems like it could be exactly what Ultimate Bet was doing with online poker player funds. I could be completely wrong, but something is definitely up. Claiming the site was hacked would be an easy out at first..
Soon after they had their accounts seized and were seriously short on money, a friend of mine simply lost all his coins out of his online wallet there. No explanation, no refund, nothing. Just gone. About $2,000 worth at the time (25 BTC).