This morning I could not place any NYSE opening order with TWS. Only DAY and GTC are available for time-in-force when NYSE is selected as the exchange. I could specify OPG yesterday and several other times in the past. I saw the same behavior last Friday. IB support told me I could choose SMART for the exchange with OPG as T-i-F and the order would be routed appropriately. Since IB "simulates" opening orders for routes that do not actually support them I am very leery of placing an order this way. If I want an NYSE opening I want to be able to say so. I am running TWS version 779.6 locally. Anyone else seen this and/or know the solution?