I would call IB with this but they are closed now. I have 2 BookTraders open as always. But today one of them would not show Market Depth, just Best Bid/Ask 1. I get a message saying I'm limited to 3 BookTraders. I guess there's an old BT hiding somewhere that I can't find. From which file can I delete all BT's? Or is there another way? Thank you very much for any information you may provide.