Refresh rate switching leads to oversaturated colors

Server Version#: 4.100.1
Player Version#: 9.17.0.38861

Nvidia Shield → Denon X3700H → Optoma Cinemax P2 Projector

I’ve been having a problem recently where a 24fps 4k HDR movie would finish, drop me back to the Plex app, but the colours would be really dark and overly saturated, almost like there was a device in the chain still rendering HDR and making a mess of it! The projector reports that HDR is no longer active.

The only way I can find to get out of it was to play a 4k HDR movie from a streaming service, like Prime Video or Netflix. Upon exiting playback, colors return to normal on the Shield.

I had tried EVERYTHING. Turning off color space matching, limiting the color to 8 bit so as to avoid any sort of switching error, different cables and i/o ports, and nothing worked.

Until, as a last ditch effort, I turned off Refresh Rate Switching in the Plex app, and bam, problem solved!

Obviously, this is sub-optimum. Has anyone else encountered this? Is this a known issue?

Thanks

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