Same as you guys, I sold some MintCoins.
Check Trade history and it shows that I sell and buy coin at the same time

Trade History
Time   Market   Price   Amount   Total   Type
2014-03-20 00:32:16   MintCoin / Bitcoin   0.00000015   50154.86739900   0.00752323   buy
2014-03-20 00:32:16   MintCoin / Bitcoin   0.00000015   50154.86739900   0.00752323   sell
Page Up Page Down

The questions is:
1. Where is my BTC or
2. Where is my Mint ?
3. Where is the Owner?
4. I believe and hope that you will fix these issues, but when?