Ok, I've just tried it, that looks like a bug. That 'short' style MAT/MOR pose is supposed to change the transmap from kozlong_tr.jpg to kozlong_extratr.jpg and it doesn't. It is loading the second map into Poser6 (it is there in the 'recently used textures' list) but it is not actually adding it as the new transmap. If you change transmaps yourself the hair renders correctly. The other MAT poses for changing texture colour (blonde, black etc) work correctly in P6, but that transmap isn't changing. And that transmap changes correctly in P4.