I have my Slingbox 500 connecting to my Tivo Roamio Pro and I know it is communicating with the Tivo. The reason I know it is communicating is that on the Mac Desktop application the channel up/down control works. But, all I seem able to do is change the channel up one, or down one. Nothing else works. I get no remote control when I double click the remote icon. Clearly, I need to setup something, but what?