someone showed me a similar problem a few hours ago... turns out they were loading the old 8.1 libraries along with the 9 library, and the part was referencing the old library.
We removed the old library and just used the v9 library - everything worked fine... except for the way the parts are drawn in elevation/3D. See the revived thread
http://archicad-talk.graphisoft.com/viewtopic.php?p=30721#30721
HTH
Wes