the problem number6, is when you leave btc and your doge in the system. The next day, small changes in the amounts, due likely to some fluctuation of values in their system, caused the accounts to be in the red, somehow. That's what was explained to me. Then it was explained to purchase slightly more than I had to offset the lost value but that did not work, then I deposited more btc to overcome this, and still nothing.
So, I have several btc sitting there and cannot access it. The same can happen to you.
Exact same thing happened to me. I oversold a tiny amount of LTC, like 4. I ended up depositing over 100, and bought and sold LTC like crazy to try and get the wierd error number down. It seemed to go down everytime I bought or deposited LTC, but I got diminishing returns. I calculated I would have had to deposit 2000+ to get the number down to 0, and even then I don't know if that would fix the problem. It's been 4 days now and I haven't heard anything from my support emails. I have a lot of BTC and LTC locked up there now >.< Be weary.