I just upgraded to 2.3 without a problem using the usual protocol, but when I write a post and "publish" it, I get the following error message.
`WordPress database error: [Table 'fronter_mextruck.wp_categories' doesn't exist]
SELECT c.cat_ID AS ID, MAX(p.post_modified) AS last_mod FROM
wp_posts p WHERE pc.category_id = c.cat_ID AND p.ID = pc.post_id AND p.post_status = 'publish' AND p.post_type='post' GROUP BY c.cat_id
However, the post shows on the blog as it is supposed to, in the proper category in which it was placed.