Quote - Looks like you have a single vertex normal that is wrong. Not the whole polygon, just that one vertex.

Try exporting without normals. Poser doesn't need them and will recalculate them itself.

The only reason to actually supply vertex normals is if you want the object to be shaded like it is twisted (sort of like a bump map effect). That's how it is rendering.

removing the normals had no effect. the artifact remains as shown.

Airport security is a burden we must all shoulder. Do your part, and please grope yourself in advance.