I'm not sure that this will resolve your issue or not. But, I had an issue when trying to connect to our servers and seeing a blue or black screen, nothing else. Then I realized that I could scroll within the 2X window and see my desktop and start menu. Note: I have 3 monitors
I went into the Connection Properties of one of my connections and found that if you uncheck the option in Display to "Use all monitors for Desktop session (if applicable)".
Once this was unchecked (and I hit OK), and I tried to reconnect to the server, *poof* I was able to connect and see the desktop of the server. All I had to do then was apply this change to each connection.