The folowing was posted by Hogwarden, in a Rosity forum, I think it explaines your problem. "You will start to run into problems when you get to having more than 256 subfolders in any library folder... Then Poser will start to truncate the names, or load the files" incorrectly. Hogwarden has a utulity called PBooost, which may solve your problem, I havent used it myself, so can't comment furthre.