Aha! Thanks for pointing out the .htaccess file to me, ColdForged. When I setup my permalinks using the WordPress GUI, it added some code to my existing .htaccess file which still had Textpattern code in it (doh!). Once I removed the Textpattern code, all was good…
Perhaps it’d be good to mention that, if an .htaccess file already exists, exsiting rules in there could conflict with those added by WordPress?
