Ah, yes...that's what I was misremembering -- the 5.1 thing.
I'm continuing to have HDMI problems after the software downgrade, so it looks like it's probably the port pins acting up.
It's nice to have the built-in HDMI test to see what's going on in real-time, but the info is not terribly easy to parse. With mine, it appears that when the EDID checksum -fails-, it's connected OK...
That threw off my troubleshooting for a while...
At the moment, the determining factor seems to be whether the HDMI test reports that the HDMI port is enabled on the Dish STB side or not (TRUE or FALSE). I dunno what throws it to FALSE, though. When it was on FALSE and I rebooted the Dish, it came back up TRUE, and then I could hit the "Reset HDMI" button and the HDMI (DVI) came through on the TV OK again...
-- KEENE