Hi, Im using v. 7 of Cinema. Never had this problem (after flipping normals, of course). Don't know if this help for v. 6: Have you tried unify normals (I think there's an option in the import panel) or align normals in C4D? Maybe some normals point "up" and some others "down". In cinema I turn off the "backface culling" option in my view menu, so the display doesn't "trick" me. also, I would check if there aren't duplicated polys, or vertex or something. The obj files exported from C4D are acceptable in Poser, I only use UVMapper as intermediate to keep the texture areas. I hope this help.