The problem might be to do with their backend, the website is up. It's like the trading engine is off.
This. It was actually lagging as others have said when trying to cancel orders early this morning, 5 hrs ago. It seems like it wouldn't be the trading engine per say, but the actually connections/sync between the engine and the web, maybe, not DDOS. Or it could be something else knowing them guys and they will all be zzzzing over there at this time anyway so I wouldn't count on it being sorted any time soon...