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 
.