Gotta say, 886.5 worked just fine. LOL. Looks like they must have corrected a problem that was existing before. When I opened TWS, all the detached windows went to where I had them, on screen 4. Prior to this I was having to move them over there each time I opened TWS.
No problem at all with the "trades" window.
I think kiwi might be right...maybe you got a corrupted file. IB can tell you what to do on that.