Larry, 1st time seeing this: Closed B-T last night (don't recall if in live or sim mode at the time) Started B-T this morning in usual way. Checked to see which button was checked and it was sim. Clicked DOM "B" for market order expecting a simulated, but it went to IB. I cancelled, looked again, sim still checked. Looked at DOM top and see it is Gray. Checked Live, then checked Sim in DOM and that solved the issue for the moment.