Eventually, I received a reply from Bter customer service and I am able to withdraw now.
So although it takes time to resolve issues, Bter is still alive!
What did you have to do to get your account unlocked? Did you have to give bter any identity card scans, or passport scans?
Cryptsy started locking people out of their accounts before it went full scam. I hope bter locking accounts is not a sign it's going offline soon.