Chris, fwiw, I don't get this seg fault using: v = vtkVersion() v.GetVTKSourceVersion() vtk version 3.1.2, vtk source $Revision: 1.522 $, $Date: 2000/05/25 20:07:36 $ (GMT) Python 1.6a2 (#1, May 26 2000, 10:07:42) [C] on irix646-64 Perhaps you could run gdb and find out where it's occurring? --Randy