Should be simple to solve ! Due the fact that the hair is a Prop " Hair Figure " it will not load any morphs until you have a figure loaded , best load first your Doll then load the hair. the hair will auto parent to your doll. now load the Inj files into the Hair it will work just fine :) .... after this act save your Hair with loaded morphs as new Hair model in your library this will prevent having to do it every time. This will most probably solve your little issue