This happened to me when I had a corrupted file in my V3 runtime. Poser just dropped the whole runtime from the library tabs. I was just able to add it back. Unfortunately I did lose a lot of data as my hard drive had some bad sectors :-( Also my DVD back-up was corrupt. Damn Nero. :-(

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire