Last friday I had a situation where my buy limit price was better than what was reflected in TWS bid ask lines. Here are the details: * I had put in a buy limit of 28.12 for AXP on NYSE * The order had been live for at least 10 minutes, probably longer * At some point AXP began showing best bid at 28.10. It stayed that way for an extended period of time * My order was "green" all the time and was reflected in "Pending". * I was never executed at my limit (this is not necessarily an issue, obviously). How is this possible? I thought that my buy limit, being highest, should be displayed. Any thoughts and comments appreciated. Thanks !