I use remote desktop daily. The Atbroker.exe application error followed by black screen seemed to be gone for a while. Now it is back. The only solution that I know of and which works most of the times is "CTRL-ALT-END" (the equivalent of “CTRL-ALT-DEL” for remote sessions) followed by ESC. When it doesn’t work, I need to log in with another user and kill the session with the issue or reboot the box – nasty.