PBR OP Snippet renders black circle

Hi,
i’ve been trying to get PBR working without success. No matter what i do i only get a black silhouette in my render, so i looked at the PBR OP snippet, and see the same result. (This happens in the newest build 44350 on a macbook pro).
What is the PBR OP snippet supposed to look like?

Does anyone have any idea what is going on?

It looks like this when working correctly, it looks like a very dark moon.
If it isn’t working could you share the specs of your Mac with us, and maybe a screenshot would help us see which OP the problem is starting with.