When my HR24 is plugged into my new V Series Vizio via HDMI, there are several options on the Vizio Picture menu greyed out - Contrast, Color, Tint for example. When I turn off the HR24, those options become available. When I plug in a different receiver, say my H24 into the same or different HDMI, those options don't grey out and stay available. Finally - I have an XBOX plugged into one of the HDMI ports also. When I'm watching DTV, but turn on the XBOX (I don't switch inputs), the audio from the DTV box cuts out and stops sending. The audio also stops as well if I actually switch inputs to the XBOX. I've tried two different Vizio TVs - same results. What is going on?