I noticed this once yesterday but twice today. I suspect it's due to a new rev of TWS that came in yesterday (I'm on 879.4). I did open a ticket after seeing it twice today (so 3 times in all) but wondering if anyone else has seen it. It starts with a pinkout -- which may be due to a network issue (though I immediately test pinging www.interactivebrokers.com afterwards and it pings fine, zero loss after 60secs, 15-20ms response times).... Then the reconnect seems to fail. In the process I see my option trader window flashing on and off. Finally I end up with the state in the attached screen shot. A blank/pinked window.... with lots and lots of tabs... I have to then kill the javaw process as the UI is totally unresponsive. If I re-launch TWS, it works fine.