Which version of Poser is this? Here's a couple of random things I can think of to check :- When you add a hair prop, is it parented to the figure's head? (It should be by default.) Do MAT poses work for parented props? It sounds as though Poser is no longer passing information to parented items. As you know, normally poses don't apply to props; or to hair items, which are just a special case of a prop. However once they're parented to a figure, an applied pose really targets the figure, but information which doesn't have a corresponding receptor in the figure "overflows" onto the prop (or hair). It may be that Poser has thrown a wobbly and needs to be given the short, sharp reinstall treatment.