I have noticed this even since I upgraded to 2.1.x, I am posting now about it. You can check my site, http://www.thepatri0t.net/
I only had TWO post categories, now even the LINKS categories are shown under post categories and once you click that you get a page not found error.
in WP-Stats plugin, under Misc Stats, the following comes up under LINK CATEGORIES,
WordPress database error: [You have an error in your SQL syntax. Check the manual that corresponds to your MySQL server version for the right syntax to use near ' COUNT(*) AS 'total_links' FROM wp_links INNER JOIN ON .cat_]
SELECT .cat_name, COUNT(*) AS 'total_links' FROM wp_links INNER JOIN ON .cat_id = wp_links.link_category GROUP BY .cat_id ORDER BY total_links DESC
Please help me. What should I do.