Ah, you're exporting from Poser. If you're not exporting from DS, then the Turbo Importer can't help much. DS adds extra information to the MTL file that the Turbo Importer interprets and applies. Poser doesn't give the importer all the information it needs to set everything correctly. DAZ has given this information to CL but I don't know if they're planning on implementing it. There hasn't been much of a clamor requesting it from them.