You didn't mention whether these are third-party figures or Meta's/Zygote's or a user's figures. I have Cacheforce's "PlanetErotica" CD & the poses (and I think the figures as well) give me that error and there is a slight delay, but it's never crashed on me before. If all the figures are from the same source it may be choking on something in the files after it checks the version number. Someone may have added something to the files Poser can't read.