I just tried a 'cvs up' in my scipy source directory and got this: cvs [server aborted]: could not find desired version 1.130.1506.4149 in /home/cvsroot/world/scipy/__cvs_version__.py,v I removed __cvs_version__.py and ran 'cvs up' again. It then worked. Can someone explain what that error means and what __cvs_version__.py is used for? Thanks, Skip