Quote from IBj:
IB has zero liquidity issues, not even close.
Our risk management systems are real time and uncompromising. If your account is deficient, we liquidate immediately. Period. It is a core part of our philosophy that we will not endanger one client by allowing others to take excessive risk.
We don't invest or participate in the market segments that have proved so costly to many investors and financial market participants. We own exactly zero CDO, CMO, CDS, or any other flavor of mortgage derivative; zero debt swaps, etc. We use short term FX rolls for treasury purposes and that is the only OTC transaction in our portfolio.
Our business is solid, and steadily growing. We are not doing anything that will compromise our reputation as a safe and conservative broker one iota. Nor will we.
The message you got from the compliance department is certainly related to the details of your specific account or activities therein. When a regulator makes an inquiry to certain activities, it is normal to restrict further activity in the account pending the results of the investigation. It is also common that the regulators prohibit us from discussing the nature of their investigation. I am not saying that is what happened in this case; I am merely providing a use case for situations where accounts can be frozen.
If you feel a FINRA involvement is appropriate, I strongly encourage you to pursue the issue with them.