Quite a few recent posts have triggered either moderation or an apparent bug producing an error of the form

Precondition Failed

The precondition on the request for the URL /wp-comments-post.php evaluated to false.

Investigating, I found that my moderation wordlist included such items as “casino” and “pharmacy”, frequent occurrences in comment spam, but also in ordinary posts. I’ve deleted them, but “casino” also seems to trigger the Precondition Failed bug.

Since the move to WordPress 1.5, the inclusion of the “Nofollow” tag in links means that they no longer count towards Googlerank. This seems to have reduced comment spam, but not eliminated it. I’m going to trim my list and see if I can found out what gives with the “Precondition Failed” problem