Problem with Bridge display

For a long time, I had a problem with Bridge in that it would display properly on the 4K monitor of my Dell 7710; however, if I moved it to another display (e.g., my Dell 2713H), Bridge would suddenly span all three of my monitors (Dell 7710, Dell 2713H, and Cintiq).  I solved that problem (which is why I mention it here) by installing NVIDIA's nView Desktop manager (Applications>Individual Settings>Bridge>Window Control> uncheck the enable application to span multiple monitors box).

Just recently, however, I'm encountering a different problem.  Some action with my mouse--I say "some action" because it occurs so quickly that I can't figure out what I actually did: Accidentally pressed R-click?  Just held the mouse in a given position too long?  Not sure what--some action causes Bridge sometimes to turn black, then disappear.  Sometimes to again span multiple monitors.  Sometimes to change the relative positions and sizes of windows within Bridge.  It happens too quickly and randomly for me to say, e.g., "Well, I pressed the right mouse button, which caused this effect."

Has anyone else encountered this?