There could be a possible bug out there for IB option traders. Today when trying to reverse a position in the options market, my order was divided into two orders, causing my TWS to freeze. I had no idea of my remaining orders and position for about 30 minutes. The programmers claim they made a change today. I wish they would tell us about these changes!! I was short 2 contracts of a particular option then attempted to buy 5. I got filled on two (IB changes the quantity to what you are short) then they attempt to send a second order (3 lot) once the two lot is filled. This caused my TWS to freeze as I was not able to cancel orders or even view executions for at least 30 minutes. (even with rebooting) I realize that this should be the case for equity trading because of downtick rules but it has never been a problem in the options market. All I can say is that you should not attempt to reverse your option positions in one trade!