I was trading LTC/NET. My orders weren't going through and so I cancelled and re-instated them at a new price. The trading engine acknowledged the cancellations with the "Your order #87687687 was cancelled" etc.
I left everything alone for a while and suddenly all my cancelled orders started COMING BACK FROM THE DEAD AND EXECUTED ALONG WITH THE NEW ORDERS !!! They left my NET balance with a massive great negative and my LTC balance through the roof.
Now I'm trying to get back into the market just because I don't want to leave my account in debt.
This sh*t really is crazy. No self respecting professional would leave a business running that was so fundamentally faulty. They KNOW the site doesn't work - leaving it open for business for unsuspecting customers is bordering on criminal. I won't say it *is* criminal because that's a matter for lawyers, but I don't think it's professional. It needs to be closed down with immediate effect and the trading engine replaced wholesale.
There is fundamentally bad business logic going on with the code - for example, no backstop validations for overspending, reporting transactions complete to the user that aren't (e.g. "your order has been cancelled"), decrementing balances before the transaction has completed. This engine has been written in a hurry - or at least it feels like it - and now it's just going to kill the site.