Originally Posted by EVT
I can confirm (and I believe Batpig also has this same issue) I have the same problem with the same DVR. However, I haven't tried to contact Denon to resolve the issue. Please, let us know what Denon says. It seems to me that this must be a Denon issue
since pressing the input button seems to fix it again.
Absolutely not -- it ONLY happens with cable box DVR's hooked up with HDMI! It has no problem with 720p from any other source, and no problem with 720p from the cable box when I used component video.
HDMI cable boxes are the #1 offender for weird handshake problems. As is usual with HDMI handshake problems, it's hard to say who is "at fault" but the common thread is clearly the cable boxes.
Also, BTW, remember that what you have is slightly different than what I decribed with the 8300HD. Going to any other channel brings GUI/overlay back, and I don't get the weird "scaler is defeated" issue you describe.
To bxconst -- search for my post from a couple of days ago where EVT and I were discussing this, I get the exact same thing with my 8300HD. Either switch to component cables, set the box to 1080i output for HD channels, or get over it! There aren't that many 720p channels anyway.