Crawlies are exactly what you might get when sending a render across a network of GPUs. That's the bugger here. GPU from machine to machine can be pretty inconsistent. And Element has no fallback CPU mode.
I think, fundamentally, Element 3D is simply designed to be a down-and-dirty 3D rendering environment. I use it for basic shapes, slabs and every job that requires a jet fighter (which so far is zero).