I had the same trouble when I upgraded. I just reinstalled, (redownloaded) the upgrade and followed the directions to the letter, over wrote files but not dir wp_content and themes and everything works fine again.
I totally like WordPress better, that there is no doubt. Sad to say sometimes I just post to blogger to get the numbers-and my family isn’t easily trained to go somewhere else.
I actually think it’s quite funny seeing the better blogging tool link-I’m leaving it up for awhile.
