If you're using Poser 5, try ticking the Use texture filtering option in the Firefly settings. There's probably better ways, but texture filtering gets rid of the split ends you describe. Also DAZ doesn't supply P5 MAT files, so basically, all of your DAZ MAT files are useless with Poser 5. Scourge's MAT PoseEdit 3 is a great solution, and I hear he's striving for more P5 compatability.