I may have remembered incorrectly. I have retested it recently and can only get it to reproduce the symptoms you describe on the first post. The HDR starts fine on the loader screen, then blanks out, then displays the live TV for a second or so followed lime green screen. My memory is not as good as it use to be!I am convinced this is not the same HDMI issue. The symptom I have observed, and appears to be reported in the other posts quoted in Post 1, does not just "flash" the splash screen – it shows the full duration of the splash screen and goes on to show a second or two of live video before going to green screen. This suggests a systematic deterministic process is at work, rather than something being "broken".
It would be interesting to know whether your example also demonstrates the HDCP pop-up message, or the switching artefacts on operation of VFORMAT.
Regarding the HDCP message that appears on an analogue connected HDR, yes I get that as well but I think I overlooked it because I followed the text instructions and only used the analogue scart (disconnecting the HDMI) for that troublesome HDR.
To induce the HDCP message I connect the green screen HDR to AV2 (analogue) and HDMI2 (digital), switch TV source to HDMI2 and the HDCP message should appear on AV2.
To get rid of the HDCP message I can leave HDMI2 disconnected, or switch TV to another HDMIx source (doesn't have to be on, wait 1-2 seconds), then switch TV back to AV2. Once I change channels on the HDR the HDCP message should disappear. This ties in with your theory that it follows an HDMI sync issue.
Note these channels seem to temporarily hide/mask the HDCP message
|1, 2, etc||any BBC channel (except 107 BBC News HD)|
|16, 36, 37, etc||QVC standard definition channels|
|95||Create & Craft|