Ok, well, one thing I see...
Tagger.py:33
Shouldn't
if not mlist.topics:
be
if not mlist.topics_enabled:
? Because this is why I'm seeing the "must delete topics" to fix the problem.
If you disable topics, but have topic defined, you still end up scanning for them.
If they're not enabled, we shouldn't bother doing the work, even if there are some
defined.