I set up yearly archives as described here:
and they have worked without a problem. Now, however (after a week of working correctly), they display the year "0" even though no posts have the date set as year 0. Clicking on the zero takes you to the latest post. If I delete that post the zero remains and is linked to what was the second latest post.
See it in action here:
(Swedish site, but you'll understand everything fine :) )
So - any ideas?