I've found that even saving to the library doesn't work. For example, I transfered my Village People models to a library folder and found that, for some strange reason, when I opened the Leatherman, the cap would show in draft mode but would not render. At all. It was like it had disappeared. Same thing happened with the headdress on the Indian. At first I thought it was maybe because these were imported .obj files, but the policeman and the construction worker both used a lot of imported obj's, and those came through fine. Weird, all of it.