Important News / Question : Today I noticed (for the first time) locked and crossed markets on IdealPro. It happened in EUR/USD several times today. When I saw it first, it were two Market Maker quotes which made up a locked market (19 M vs the 4 M not executing). Ok, I thought maybe IdealPro is programmed not to execute MM's quotes against each other. But later I saw a customer order sitting around not executing against the quote. How can this happen ? Has IB made changes allowing MM's to execute trades selectively or to back away? See attached screenshot. Please not also, that the market was locked for at least 15 seconds.