Make sure you have the object file in Runtime:geometries:hair folder Look there and delete the rsr file if using P4 then try again. Remember the long hair is a conforming object so conform it to V2. Also, there are mat files included for the appendix version also under Koz_long_appendix. The names don't all show in the Pose library. The conforming one starts with Mat_Koz. Hope that helps.