I actually had an amusing failure just yesterday... Had some items organized into a runtime on a folder named "PP/P5." We Mac users don't usually think of the "/" as a hierarchy indictor. Unfortunately Poser does. So when I pointed Poser at "PP/P5:Runtime:Geometries:My_folder:My_object.geom" it saw "PP:P5:Runtime:Geometries...." and squawked "This is not a Runtime folder!"