We just added some new computers to the system with Windows XP on them. The rest of the system has Windows 2000 Professional. We keep all of our customization files and stock PC3s and CTBs on the server and point the AutoCAD 2002 Search Paths to them. The new computers are giving error messages about an "unexpected null pointer" when trying to plot using some of the old PC3s that were created on 2000 Pro computers. Does AutoCAD require a separate set of PC3s saved for XP computers? Any suggestions about how to solve this without saving the PC3s locally on all the stations?