upgrade to 2.3.1 gives database syntax error

I upgraded to WordPress 2.3.1 and now I am getting this error at the top of my blog.

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 '495,493,492,491,490,488,487,485,484,481) ORDER BY post_id, meta]
SELECT post_id, meta_key, meta_value FROM wp_postmeta WHERE post_id IN(,495,493,492,491,490,488,487,485,484,481) ORDER BY post_id, meta_key

Also there are THREE blank dummy posts showing up before my first correctly posted entry is displayed. When I checked my admin area there were no blank posts in there.

Can you please guide me what could be the issue?