I'm recreating a Zope site from a SunOS server on FreeBSD. Zope starts but as soon as anything is accessed (including the ZMI), it bombs out with just: LOG('ZODB', WARNING, 'Could not import class %s ' Bus error I rsynced the ZOPE_HOME from the SunOS server. Could it be that there are things in the ZOPE_HOME that are compiled for SunOS? However, I have done this successfully for another version of Zope. The only thing you can access (provided you access it before anything else) is the DeadlockDebugger , which then doesn't show the normal 4 threads - it only shows: Threads traceback dump at 2007-11-26 17:00:02 End of dump ____________________________________________________________ FREE 3D EARTH SCREENSAVER - Watch the Earth right on your desktop! Check it out at http://www.inbox.com/earth