Jeff,
I was able to switch video input in tuner mode by pressing the "video select" button on the front panel and then turning the big "function" knob. What a pain in the ass! Shame on Denon again.
I've never tried out the tuner section on this receiver until today. All I get is static. No reception at all. I don't have an antenna hooked up but shouldn't I at least get something from some of the stronger stations (middle of Dallas/FT. Worth)? WTF! My old Sansui pulls in at least half a dozen stations without an antenna. It is not crystal clear but at least its some signal.
