I've been having some problems lately since my last Wordpress upgrade, apparently I had too much stuff hacked so the upgrade didn't go as smooth as I thought. So I just reinstalled :).

Followed these steps:

• Backup old DB and blog folder

• Fresh deployment of wordpress-2.3.1 files

• Drop database, create database, wp-admin/install.php

• Edit a copy of my backed up SQLdump, and dumped it again in the new DB (only posts, comments, links and data information, no configurations or plugins tables).

• Customization left.

It was much easier than I expected, I did not run into any kind of problem at all :D .