Pixel: I think there was a problem with start up in the case when you have no existing file, no default file, and no files to import. This will be fixed in the new version. I use Dovecot version 1.0.15, did your rules show up before you upgraded dovecot, do you still have your rule file etc or are you starting over?
New version should be done this weekend sometime I hope.
That's correct, I wanted to post the same, because I came to the same conclusion.
I added a filter with the Thunderbird manageSieve plugin. When that one was activated, you're plugin worked again.
I got the errors because I cleared my sieve directory, so all existing rules where gone.
Maybe it's an idea to keep old versions online? So I could install the old one?