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Bill, I’ll Dropbox you a short HLG clip from my GH5 to try later. In my case there’s no question that my OLED is being properly triggered with a legitimate HDR encoding when it’s present. I’ve played countless HLG clips & shows from YouTube, Directv and my own material, that have played perfectly.
With that said, I’ve learned that YouTube can have the HLG encoding that triggers a TV’s HLG logo, but it’s obvious it’s not always correct HLG. In fact I’ve uploaded a number of HLG clips I’ve marked ‘private’ for testing purposes, encoded in different ways, that YouTube recognizes as HLG, but doesn’t present them properly in HLG. I’ve now come to realize, when playing clips from YouTube, that the HLG logo on the TV is no guarantee that the clip will play with the dynamics that they originally had.
I’ve gone into the ‘stats for nerds’ on YouTube, and my encoding looks identical to other clips, from other YouTube sources, that play perfectly on my TV.