My Monthly Withdrawal Limit just went negative. Didn't do anything special, just logged in to make a withdrawal. The system is now only allowing my to withdraw part of my funds for some reason. The whole list:
Daily limit $0.00 / $20,000.00
Monthly limit -$90,893.78 / $100,000.00
Current balance €6,220.34
Withheld €0.00
Withheld (converted) $0.00
Maximum withdrawal €4,607.66
No idea why I can't withdraw the full 6.2K Euro. Even if you read the montly limit as a positive number, there's enough limit left to withdraw more than the indicated 4.6K. I have no open orders.
edit: Ok, after withdrawing the 4.6K, the withdraw page now lets me withdraw the rest, so I did that.
edit2: Just saw a post from another forum where someone is having this issue (http://oi42.tinypic.com/2chtlld.jpg). What I noticed is that the ratio max_withdrawal / total_balance is the same (0.7407) for both me and the other guy. This may help you folks in tracking down the issue.