I'm a bit late late to the party on this one, but yes, definitely looks like ngons, which Poser and Daz Studio refuse to render properly. Any object intended for use in Poser or DS absolutely must be made up of quads and/or triangles. Also, Blender's .obj export function is basically borked. I had serious issues recently with getting a Blender mesh to render correctly in DS. It was all triangles too. I imported the Blender exported object into Wings and exported it straight out again. It then worked fine in DS.