Screen blanking when switching to/from HDR
I've spent the requisite several hours trying to deal with this problem and I'm hoping someone here might have a suggestion. Looks like others are having similar issues ITT...
1) Newly acquired Denon X4500H w/ latest firmware (just updated an hour ago)
2) Epson 5050Ub
3) Roku Ultra
4) Monoprice 18Gbps 1' Cable (Roku -> AVR)
5) Monoprice 18Gbps 25' Cable (AVR -> PJ)
When switching from SDR to HDR and back, be it in Youtube, Vudu, Netflix, whatever, there's a 5-10 second blank screen. Same as if I was switching sources. The video quality after it switches is fine, there are no dropouts, no snow, nothing to indicate a bandwidth issue. This also happens every single time I enter or exit the Denon setup menu when video conversion is switched off. This is SUPER annoying as not only does it make adjusting settings without interrupting movies impossible, but it also happens anytime I fast forward or rewind an HDR movie. E.g. in Vudu if I want to skip ahead a few minutes the little timeline pops up, I scroll to the scene I want, and when I select it the screen blanks for 5-10s. Every time. Same with Youtube, there's a ~10s blank screen when entering or exiting an HDR video, or jogging back/forth in same. Ultra annoying.
If I connect the projector directly to the Roku (with Cable 2 above) this doesn't happen at all; no blank screen. The resolution drops briefly while it buffers and loads the scene, and it switches seamlessly from SDR to HDR and back without any blanking or interruption. So I think the Epson can handle this just fine. This blanking also happens if I turn the AVR off and have HDMI passthrough enabled on the Roku.
What I've tried:
1) Switching cables
2) Changing Roku output between 4:2:0 and 4:2:2; no dice.
3) Changing Roku output between 4k60 HDR, 4k30 HDR; no dice.
4) Turning video on and off.
5) Turning i/p scaler on and off, and forcing 4k resolution or 4k (60/50) resolution.
6) Plugging Roku into different HDMI ports per the Denon suggestion to get closer to the HDMI output.
7) Tried both HDMI1 and HDMI2 outputs
8) Changing 4k signal format between Enhanced and Standard
9) Unplugging all HDMI ports, powering off all devices, replugging, then powering on PJ -> AVR -> Roku. No dice.
10) Forcing the Epson to SDR mode
11) Turning off all HDMI control features on both AVR and PJ
12) Changing PJ EDID mode to Normal
Nothing works! This didn't happen on my old Denon E-400 I got near several years ago, although I had to use an HDMI splitter/EDID emulator to allow HDCP 2.2 content playback. 4K HDR @ 60 fps worked fine with all the same cables and equipment (aside from AVR). While finicky to setup it worked just fine and didn't have the above problem. I've read a few posts where people solved various blanking issues by using a splitter like the one I linked (I returned it) but come on! This is a $1600 receiver, it's really going to be one-upped by a $50 HDMI splitter? I was really hoping to simplify my setup and avoid workaround like the above.
I'm thinking of trying a different HDMI cable; maybe the Roku can drive that long cable just fine while the Denon has some issues doing so and would benefit from an active or fiber optic cable. But I'd rather not just drop $100 on a cable unless there's some evidence this would work. I could also try another splitter or something like an HDFury but again, I'd like to see if anyone has fixed this problem without dropping more $$$.
If anyone has experienced this or knows a solid workaround I'd love to know! I have to say that I'm quite disappointed that an AVR of what I consider to be a fairly high caliber has this problem, but I'm willing to try and find a solution. If I have to return this and try another AVR, so be it.