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This part of the error is the key:

import objc
ImportError: No module named objc


This suggests that the python framework being used does not include objc. The Xmarks app points to the default Apple system python 2.5 framework which does include objc out of the box. I suspect that this system framework was altered at some point on this machine - possibly a different python was installed over the top.

You can check this by launching the system provided python 2.5 doing this from the command line:

$ /System/Library/Frameworks/Python.framework/Versions/2.5/bin/python

The trying this import:

>>> import objc

If that fails then you have an altered system framework - repairing that is the next step. The folder hierarchy you need to recover from a backup of other 10.5 machine is /System/Library/Frameworks/Python.framework/Versions/2.5