I have a slingbox 500 which is connected to a Cisco RNG 150N. When I'm viewing it on my iPad or via slingbox.com the only way I can change channels is by using the up or down button on the simulated xfinity remote. When I try to do this from the guide or by entering a number it acts like its changing the channel but always stays on the same station. Do I have something wired wrong? Is there just an issue with this Cisco box?