[Bibio]

think i have found the culprit. madVR...

i turned everything off in madVR including resolution changer and the only thing that i kept on was the HDR passthrough.

i set up MPC-BE to change resolution and added the appropriate ones to the list. this works much better but i still have one bug. occasionally the resolution of kodi will drop to 800x600 when i exit the external player after playing HDR content. so far all other content seems fine.

without using madvr everything works perfect but obviously no HDR switching of 4k content.

i'm using the latest build of madvr and i would be interested to know from the people having no problems what build version of madvr they are using.

it might be an HDMI cabling issue so i will try different ones tonight. the ones i'm using are medium quality high speed with ferrite cores on them and were supplied by sky, virgin and oppo. i have only ever bought HDMI2 high speed as they were used for 3d 1080p before the swap to 4k.

yes the new amp passes HDR :-) so now the whole chain is HDR and HTPC 2.2.

more testing tonight...