It's a reasonable assumption that they are holding back withdrawals until they're open for trading again. The few asset withdrawals they enabled must have shown them they would just hemorrhage funds, which would promptly go to Polo and elsewhere. 60% of UNITY has already been withdrawn, for example.
No one save for bter can forbid you to withdraw the coins once they restart the exchange. And if they really open it in 48 hours or so, this won't be a big deal that they didn't allow to withdraw the altcoins. Remember, they had 7k bitcoins stolen, and they had (or still have) to settle this issue somehow.
I am strongly dissagree that 3 weeks of holding user's alt coins is not big deal. I am losing money each day while they hold it. And i am strongy dissagree to continue pay my money to resolve bter's problems. You not agree with me but i still think that exept obvious scam explanation there are only one reason why they didn't open withdraw alts for 3 weeks is fact that they fear to let people run away from exchange with alt coins, before they restart trade, they proly think if we will withdraw coins we will never return them. But i lose money due of such exchange behaviour and it kill any wish to deal with such exchange in future.
