Excerpts from Dirk Hohndel's message of Fri Dec 11 07:11:04 +0100 2009:
> Is there a workaround?

For now, you can do 

  notmuch dump somefile
  mv Mail/.notmuch /tmp
  notmuch new
  notmuch restore somefile

Which will re-index all your mail, and restore your tags, as far as the
messages are still called the same. Deleted messages will disappear from
the library, and moved messages remain in the inbox.

Still a pain in the ass, but at least it gets rid of all those errors.

- Marten
-- 
- Marten