elektrik,
I commented on your post but I guess you haven't seen it yet.
Try the settings for your DirecTV receiver. Try the advanced settings as well.
As long as you are able to change channels with the dtvcontrol utility, this plugin should work.
Actually, I did see it, and yes, I can use that utility to control it, however, when I change channels in MP, the screen is blank. Perhaps I have a tv card configuration error, instead of a Directv error, except that the "one" channel I get (channel 4 because that's the Directv access channel) comes in fine....weird