You are mistaken. I have moved my V4 and other libraries several times across multiple machines with no issues. edit: Paths saved for your own custom things may be absolute if they were saved from some old Poser, but 2010 saves relative paths.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)