On Friday 8/19/2011, Interactivebrokers liquidated my 5 positions. The reason was I didn't have enough cash to cover option assignments. I reviewed my account statements the following Sunday and found 1 account didn't have enough cash and 2 liquidations are valid. But the other 2 accounts had more than enough cash and margin. So 3 liquidations are obviously wrong. I contacted IB and ask them to restore my positions. After 3 days of delay I was told those liquidations would stand but I could file for compensation. Another 3 days later I was told those liquidations would stand and IB can liquidate whatever they want according to account agreement. Basically they are saying they can screw their customers whenever they want. I've been with IB for more than 10 years, I know their customer service is bad, but the trading system is ok. Now I know they just want to rip off small investors and they don't even care about their reputation.