Quote - Poser does not like n-sided polygons (n>=5). I always use UVMapper Pro to triangulate anything that's not a tri or a quad.
UVMapper Pro can cneck for degenerate and non-planar facets and fix the problem by triangulating them. I'm not sure whether the free version of UVMapper can do this too.

I have UVMapper Pro but could not figure out how to check for non planar facets or degenerate ones.

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