This bug is an absolute catastrophe for a futures broker and it happened to me multiple times now. The worst is you can't tell when it will happen - there are times it will not - and above all it is possible that you can't get out of an open position :eek: As far as I can reproduce this issue it will happen with Euro dominated futures. Margin is in EUR but will be translated into USD. When you place an Order a wrong calculation leads to a system error which goes like: Risk violation: Max credit = 0 USD, Order would need credit of xxxx* USD *this number is EUR margin translated into USD This message makes absolutely no sense since there is enough margin available. And it makes no sense at all when you just want to close an open position and have no other working orders This issue happened to me the first time in November 2008 and I was assured they 'd fixed it. Guess what happened next time placing an order... Now they say this bug has top priority...blah blah blah. It cost me quite some money and I 've stopped trading with them. There is some video material I will possibly publish showing DOM and error message since I generally tape my trades. I'm curious: Is there anyone who experienced this bug, too?