When in remote desktop running only one application (the desktop is not available), the window borders are not drawn when not maximized (they are black).
Unfortunately, I haven't been able to setup a server to reproduce this behavior, but I've managed to get a similar problem with a screenshot program.
It is called Greenshot. When I take a screenshot for the active window only, the borders turn black and the program hangs.
I hope that fixing this problem will fix the remote desktop one.
I'm sorry for not having more details for you.
Stephane Senecal
CIS Group
Delphi programmer since 2001