Great New Cessna 150L - Propeller Transparency Problem

There is a fantastic freeware Cessna 150L at http://drk.free.fr/tutoriels/creation/c150_en.phpI'd been hoping for a great payware Cessna 150 or 152 and this download is a very high quality model - as good as payware IMHO.Kudos to the developers.The model was meant for FS2004, but I'm using it in FSX.It works great, but when the engine is running the prop is totally transparent - instead of the semi-tranparent animated disk.No ideas why this would be - in FS2004 the prop is visible. All textures were copied over to FSX, I believe.Any help on a fix would be appreciated - and check out this great new model.Thanks