Tried to hit a bid in a fairly illiquid market for NYSE equity option. Posted by PSE, repeatedly tried to hit, but despite the order being confirmed live by TWS, PSE would not take it. Called IB, after ~30min finally got an answer from PSE - they were only accepting orders to close positions - no opening orders accepted, period. The simple solution to this problem - in TWS order sheet, selected "close." Then it was accepted right away at the bid price, despite the fact it was a short sale. No one at IB cust svce could explain this. metoox? You seem to be the options guru here - can you tell me why it was close-only, and where this information might be available prior to placing an order?