I have used OPG limit orders on NYSE stocks for many years through IB. Here is how OPG limit orders have worked in the past: 1. I submit my OPG limit orders at 9:20am. 2. When the stock opens, I either get filled or the order is cancelled. Lately, I have been seeing this: 1. I submit my OPG limit orders at 9:20am. 2. After 9:30am, and presumably after the stock is open for trading I see bid and asks on the NYSE but my order is still active (green colored status). So it appears that my OPG order was not filled, but was not cancelled either. It also appears the order isn't really active anymore, i.e., if it were converted to a limit order I should have already been filled in some cases (because of where the stock is trading), but I am getting no fills. Is anybody seeing this kind of behavior or is it just me? Note that it doesn't happen all the time, but it is happening for around 50% of my NYSE OPG limit orders.