I'm also trading on this site but everything was fine for me.
The problem is not in the trading but in the wallets. Try sending your coins back and fort from your PC wallets.
here are the problematic coins.
Alphacoin - can't withdraw
Globalcoin (GLC) - Lost thousands of coins.
Krugercoin - can't deposit
This sucks, won't they just remove that from trading if they can't fix that stuff out?