Go into the HAIR ROOM(no agression meant) and look for a DO COLLISIONS checkbox. That's your culprit. Turn it ON for each hair group. Do a Calculate All Hair and Cloth sim or just for a few hairs to test. OH! And do the CLOTH SIMS FIRST!!!!! Seriously...don't mess that one up! LOL! http://www.youtube.com/user/corinthianscori?feature=mhum