I've struggled for hours trying to upgrade from 2.9.2 to 3.0.1. I have done all that's required (plug-ins disabled, etc.) and no matter what I try, whenever I upgrade the database (about half a gigabyte) through wp-admin/upgrade.php the process immediately hangs with the following error.
PHP Fatal error: Call to undefined method wpdb::tables() in /home/techright/public_html/wp-admin/includes/upgrade.php on line 1403, referer: http://techrights.org/wp-admin/upgrade.php
I do not know where to proceed from here. Hours spent researching to no avail. I can get 3.0.1 running at the front end, but I can't get to the admin panel without upgrading the database (which I can't do because of this error).