Logging in to the web UI can fail with a server error.
MR !25 (merged) removed
SESSION_SERIALIZER = 'django.contrib.sessions.serializers.PickleSerializer'
from mailman_web/settings/base.py.
Installations which contain
from mailman_web.settings.base import *
in their settings.py and upgrade to mailman_web>0.0.6 will have their SESSION_SERIALIZER changed to the default JSON serializer, and if there are any old pickle serialized entries in the django_session table, the users who own those sessions will get a server error when visiting the site. Users can work around this by clearing the sites cookies from their browser. The site can avoid this when upgrading by removing all the entries from the django_settings database table, i.e.
DELETE from django_session;
See hyperkitty#455 (closed) for more info about this change.
Edited by Mark Sapiro