I set up my slingbox at home, and it worked. I went to a library to access it by wifi. I had to do another download, and then I was able to access my set top box by wifi. I am now at a hotel, and when I try to use my slingbox to access my set to box, the screen on my PC says, "The connected video signal is not supported." I have changed nothing since I was able to access my set top box by wifi at the library. What do I need to do?