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Update: I forgot to mention that you must hack a core file and adapt your theme, too. See the end of the article. ...

If you're using the latest bleeding-edge SVN version of WordPress with Ultimate Tag Warrior, check your feed's validity. WordPress is finally getting around to implementing Atom 1.0 instead of sticking with the comparatively ancient Atom 0.3 (even the validator's support is deprecated).

Unfortunately, due to the way WordPress and UTW work, UTW doesn't have a way to really know what kind of feed is requested -- the hook it registers is called the_category_rss, and it's called with a parameter that's either 'rdf', 'rss', and sometimes blank.

Even more unfortunate is that the_category_rss is called when an Atom feed is requested. UTW happily inserts the hardcoded <dc:subject> tags into the feed, and since that's been superseded by <category> in Atom 1.0, and WordPress doesn't declare the Dublin Core namespace anymore, your feed has just become invalid. Fix after the jump.

If you're running WordPress 2.1 trunk from SVN (currently at 2.1-alpha3, r4663) with Ultimate Tag Warrior (UTW) 3.141592 (the latest version as of today), UTW will lose all tags on a post when a new comment is made....