Ah .. it MIGHT be a Mac problem although.. it shouldn't be.

I read the general PDF to get an idea how to do what but I didn't follow a tutorial per se (I'm so BAD at readmes and tutorials... I'm a hands on - poke this - person L

And Aeilkema.. it might be a shadowing problem. I did indeed render this with indirect lighting - and since this is the first time I've used that blue shky and the sand texture it could be either one that is the culprit. The other three pics I've made so far with the Terra Dome has used other grounds and other skies and I haven't had this problem before.

It's interesting that your squares are black though.

Could you perhaps try to render something with the BlueUV High sky and the sand texture and see if it's the two in conjunction that gives these squares.. if it's a specific combination we can either avoid it, or suggest it to RDNA as a "bug" and PERHAPS it's someting that can be fixed :)

I havne't looked into how the nodes are connected so I don't know if it IS indeed a shadow problem or something else. But  so far I'm REALLY liking the Terra Dome. It has enabled me to do Bryce-like renders in Poser :D
(and I was a Brycer before I ever heard of Poser, so....)

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.