*If you made it in Modo ..it can be MODO that made the error..*

I have them too ... OBJ files exported from Modo that have stray polys that does not align with the rest ...

The actual obj. was exported from Lightwave.

Are you sure they were simply reversed? DS doesn't like triangles that have an extra vertex along one edge, and tends to render them black, but flipping the geometry shouldn't have fixed that.

The problem areas actually were triangles with an extra vertex along an edge*.* Flipping the polygons solved the problem on one side of the symetrical object but not the other*.* At that point I deleted the bad polygons and rebuilt them. (Still triangles with an extra vertex.) This resulted in the problem areas migrating to nearby polygons.

A triangle with an extra vertex along one side is a good way to go from high poly to lower poly. I still have some of those and Daz Studio can handle them, but should I avoid this topology in the future?

Load the OBJ in UVmapper, and directly save it with the "Don't export normals" box checked.  The result will be vn-less and usually correct.

Thanks for the suggestion. *

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