I've noticed problems mainly occur if you have something (be it a prop or a character) with too large a texture. Just yesterday I struggled with an image that just wouldn't render. Didn't even give me an Out of Memory-error. It got as far as to "Rendering" and then it simply froze. Once I turned down the texture size (Not at my Poser machine and I can't remember the exact wording) to 1024 instead of the 2000-something it was at, it rendered just fine. And the image was consisting of a M3 and a V3, none of them fully injected, and the Palace Entrance from Daz. I suspect the textures on the latter to be the culprit in this case, since it is a HUGE prop.

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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.