I have upgraded an "old" 2.1.2 WP blog with the new 2.3.1.
The problem is that after the upgrade I'm not able to access the dashboard. When I try I get:
Fatal error: Call to undefined function get_admin_page_title() in /var/www/hitechmania.com/wp-admin/admin-header.php on line 12
I don't know if this could help, anyway the URL of my blog is http://www.hitechmania.com (the theme has still to be fixed for the new version). What can I do to fix it?