I'm having a problem with files becoming unreadable in Poser 6.  They show up ghosted in the folders, sometimes only minutes after I've loaded them into the scene and subsequently deleted them.  It's happening with .obj and .jpg files.  I just downloaded a new file and all the textures are ghosted.  I've tried to drag them on to the desktop and apply them manually in the material room but nothing works.  The files themselves are fine because they can be opened with other applications.  Does anyone have any idea what is happening?  For information's sake, I run a Mac with OX 10.6.4 and 4GB RAM.