Yeah i got the M4 displacement maps. Now that people have mentioned it, i noticed that my horde werewolf's hair had the same problems you were mentioning. I used the material changegamma script that came built into poser and set the gamma for displacement maps to 1, and that corrected it. I've been messing around with a few other things in poser where i had problems, so i haven't tried them out yet, though that's next on my list.

One thing i was wondering though. That changegamma script has all the maps except for the specular maps. Do i also need to worry about changing the specular maps gamma to 1 also, or can i just ignore this when using gamma correction?