I am running 7.1.5.0 under Windows 10 (both server and viewer). The server is a laptop with an external monitor connected; the desktop is extended to both displays. The built-in display (the primary display) reports being connected to the on-board (Intel) graphics while the external monitor is connected to a discrete (Nvidia) graphics card.
Under Full control on the viewer, the window has space for both displays but only the built-in display is visible. The rest is black. Windows on the external display can be moved to the built-in display and become visible. Anything that is moved to the external display vanishes. Mouse clicks on the external display side don't seem to do anything.
This happens in all viewing modes. I can view the built-in display alone. If I try to view only the external display I get the full extended display, but with a static copy of the built-in display (instead of black) where the external display should be.
I wonder if this is a configuration problem.