I tried that settings file, didn't seem to make a difference

Also tried 4 different HDMI cables, didn't seem to make a difference

During that test, I ran into another interesting observation:
my TV has 2 HDMI ports. One is labeled HDMI1, the other is HDMI2/DVI

on HDMI1, I can run at 480, but when i tried to switch to 1080p, I get black screen. I tried openVIX there and it was working at 1080, but sudenly the screen went black saying no video signal

on HDMI2/DVI, I can switch the video in TNAP to 1080p and I get a picture, just not on initial boot. And OpenVIX seems to display 1080p reliably even on a fresh boot.

Port HDMI1 on the TV works fine with a PC at 1920x1080

weird, right?

note that this video problem started with the receiver connected to another, older TV through an HDMI switch (which we are still using without a problem with our Roku)

also, I noticed in the setting file, the first line in the one from openVIX is config.av.videomode.HDMI=1080p while in TNAP it's config.av.videomode.DVI=1080p
would that have any importance?

Thanks