Kein HDR tone mapping mit dem Dezember Update über Media Encoder

Are you the same user as the OP, "traveller ..."?

I am not sing LUTs.

I also tried the ME Beta with the same wrong outcom. 

I now went back to ME 25.0 and everything works correctly again, as before.

Have you added any LUTs into the Program file folders amongst the original ones?

No Neil, as you can see from the screen shots I am not using LUTs as I import it native.

The LUTs are also identically in both directories PP and ME.

You are using a LUT ... right?

Where is that LUT on your system? As ... if you put it in with the Adobe provided LUTs folder in the Program/Package files Premiere Pro/Lumetri/LUTs folder, this would be the expected behavior.

As Me can't see into Premiere's folders. And users should never park their LUTs in with the provided ones for several very good reasons.

So ... is that possibly the issue here?

Here are the lumetri settings:

The ME settings are correclty copied from PP. But the preview shows already a flat picture:

That's the right panel, unfortunately, some of the sections are "closed" ... not twirled down ... so we can't see the Project settings, and check if auto detect log, or other things, are off or on. 

I hope it is this:

That's the Lumetri "Edit" tab. Where you adjust the colors correction tools.

We need to see the color management settings, in the Lumetri Settings tab. Where you set color management.