[snipah]

HDR working just fine for me on the Beebox and NUC with latest Creators Update and recently released HDR enabling GPU driver. Only downside, it's not dynamic, you must turn on and off in display settings. 4K 1:1 rips play just fine with native tv/movies app.

Sent from my HTC 10

Which native App ?

I believe Windiws Kodi does not have HDR support, is this correct ?

And from all accounts PowerDVD is buggy, is this also correct ?

More details need to be posted because everyone reading is very confused at the moment reading this thread about HDR Kaby Lake support. 

Maybe I can help here. Fact is, that HDR is supported by Windows 10 since Fall-Creators update but it only can be activated for the whole OS, not dynamically as needed. So if you switch it on, anything is displayed in HDR. You can then start and HDR-Movie within Kodi and it will be displayed properly and looks really nice. So the solution would be, if Kodi would flip the HDR-switch in Windows when needed... when HDR-content is being played.

You can really say, that the Windows-HDR-implementation is bullshit. No-one needs an always-on-HDR on OS-level