Actually for me XCP withdrawals from Bter have always taken a few minutes to show up on blockchain.info. I withdrew 900 XCP today and after it didn't show up on the blockchain after 5 minutes I knew something was wrong. I went to the deposit/withdrawal page and XCP is not even listed. So you are not the only one. I initiated a support ticket 7 hours ago and have not heard back. I am thinking either problems with counterpartyd on their end or worse a hack and they froze XCP withdrawals and are sorting things out before they announce anything. I hate centralized exchanges.