Go to Edit->Preferences->Misc and disable the option to use binary morph files. Then you'll have to recreate the figure and re-save it to the library. This is a very, very nasty bug that's tucked away in 6 and has caused me a lot of trouble. I used to just disable it before adding figures to libraries, but I've since found that this vile bug can also make its presence known when saving a scene file; as in a recent case where Stephanie Petite lost all of the expression morphs because they were arbitrarily dropped from the .pmd file by Poser 6