If i change one word in the other Imagebrowser (like in the caption or copyright-field) suddenly all new correct IPTC-Data is showing up for this file in PM. Most strange about this i did the last change in the photos with PM under XP so it's very strange that PM is not possible to show the correct data under Vista64bit ( though the cause of the whole mistake is maybe one of the other softwares i'm using to edit Metadata)
Really you should have a look in those files.