Image sample above for issue below.

Hit another snag with the exporter 1.30d, which is pretty much what Latexluv experienced a page ago. What appears to be happening is for materials that have solid (ie. no textures attached) diffuse and specular colors set to black are being dropped off at the time of export. Without them, LuxRender will default everything to white and blow out the other attached colors or textures attached to the mesh. As a work around until the next version, simply going into the file itself with a text editor and setting the color Kd/Ks information to [0 0 0] or slightly higher fixes the issue. That, or giving everything in Poser a different color prior to running LuxPose would work as well.