I'm using UTW 3.141592 on a trunk copy of WordPress (2.1alpha3), current at the time of posting.
Whenever a comment is added to a post, the post's tags gets reset to DEFAULT_TAG_NAME.
I don't really expect much to be done about it at this point, but I thought I'd just let you know that there may be a compatibility issue once WP 2.1 is released.
As an aside, this behaviour appears whenever a comment or a trackback is added to a post, whether by a non-registered or a registered user. However it doesn't seem to affect entries if the comment goes into the moderation queue or is marked as spam.
It's getting a tad annoying now because it means that everytime I receive a comment or a trackback, I have to edit the entry and tag it again.
I logged the SQL queries that WP was doing when a new comment was added:
INSERT INTO wp_comments (comment_post_ID, comment_author, comment_author_email, comment_author_url, comment_author_IP, comment_date, comment_date_gmt, comment_content, comment_approved, comment_agent, comment_type, comment_parent, user_id) VALUES ('1', 'admin', 'ccc@xxx.com', 'http://ketsugi.com', '127.0.0.1', '2007-01-06 00:20:43', '2007-01-05 16:20:43', 'test', '1', 'Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en-US; rv:1.8.0.7) Gecko/20060911 Camino/1.0.3', '', '0', '1') UPDATE wp_posts SET comment_count = 4 WHERE ID = '1' delete from wp_post2tag where post_id = 1 DELETE FROM wp_postmeta WHERE meta_key LIKE '_utw_tags_%' AND post_id = '1' INSERT INTO wp_postmeta (post_id,meta_key,meta_value) VALUES ('1','_utw_tags_0','no tags')
I guess the interesting bit is the delete statement for the wp_post2tag table. I'm not sure why exactly that's getting called, but this might help you in trying to pinpoint the problem.
This fix *does* work if the comment is automatically accepted. However, if it has to be approved, then when the admin approves it, the tags get wiped out as before.
