Thanks for the feedback, I'll give them a call on Friday then when I get back into town and have the unit in front of me.

Steve suggested I do a reset last time I called and that didn't seem to help. I also switched of Auto Poll and still no luck.

It seems like if I select other input sources (like DVD or Video 2) from an off position, then it always works fine, so I'm wondering if its just the Video Input 1 issue or if its somehow incompatible with the DirecTV DVR model R15.