Using a Denon 4306 with no problems.
Two hr20s >HDMI>4306>HDMI>Mits 73-727.
I was having video dropouts on the Mits using the HDMI 1 input and so had been using the HDMI 2 input.
Today, I switched back to HDMI 1 and after a brief trial, I found no further video dropouts. I wonder if the HDMI 1 module is a little more sensitive than #2.
Tonight I will continue to use HDMI 1 and see if the signal remains stable.
Re: Staszek's comment, I also had the same results with cable connected directly to the Mits, so that eliminated the possibility of A/V receiver problems.