People are rendering blackish/ultra shaded

For context, I am on a Mac using SketchUp and rendering in Thea Render. Everything works great from 3D Bazaar except for the people renderings. Every time I go to render they are either completely blacked out or heavily shaded looking. Whats odd is completely randomly if I start a new file (not everytime, maybe 1 out of 5) they’ll render totally fine. Any ideas on what this could be?

I am not able to reproduce this issue with Thea 3.5.

Which version of Thea are you using?

Can you give me the name of one of the people model that it happens with?