On my TWS, I have both the SMART and the Directed quotes showing. I realized recently that ISE never shows a bid or offer for several of my stocks. I checked the quotes from my other brokers and saw that ISE is showing bids and offers, I just can't see them through IB. These are stocks that IB claims on its website can be traded through IB and IB allows me to create an ISE data line for them. (Two examples are TIP and EFA). I assumed that this was a tech issue and opened a ticket. Customer "service" claims that this is deliberate and that IB chooses not to support routing trades for these securities to ISE or to display the ISE quotes for them. This sounds like fraud to me. If they don't want to support routing trades to ISE, they shouldn't list it on their website. The also shouldn't allow the creation of a dataline for ISE which displays blanks regardless of what the actual ISE quote is. Even if it's not fraud, I think most people would be surprised to learn that IB would prevent them from routing their trade to an exchange to which IB belongs and which has liquidity. I certainly was. It's not quite what one expects from a "direct access" broker.