Wow that sucks ... lucky I withdrew all my funds the other day... Now they are sitting here:
https://vircurex.com/ but maybe the same can happen to these guys?!? Anyone has some experience with vircurex.com ? Is the owner in this forum?
Never keep all your funds on one exchange. Anyway only keep funds on an exchange when you need it for trade, withdraw what you don't need to trade at the moment. No exchange is risk-free, and by minimizing the time funds sit on an exchange, you minimize your risk.