This is absolutely baffling. My Poser 4 (no apologies, a fine program) works perfectly but, suddenly, when copied to another drive, internal or external, it no longer does. The difference? Characters and objects open OK but are invisible. The folders and files are exact copies; compatibility with XP is selected; there are no viruses; everything is absolutely the same between the two sets of folders and files. In the past I have always been able to duplicate Poser in other drives. What can the problem be?