On one of my machines, running e.g. bin/zeopack -p 8100 -d 7 fails with the following error:
Unhandled exception in thread started by
Error in sys.excepthook:
Original exception was:
Yes, that is the full actual error message.
Plone 3.0.6, Python 2.4.4 on Debian.
If you need any more information, I'd be glad to provide it.