I've completed the upgrade from 2.1.3 to 2.2. When I tried to run the upgrade script, the expected upgrade window never displays, but when I view my blog the new version is listed in the footer.
Then when I try to bring up the login screen, I get the following error message:
Fatal error: Call to undefined function: get_admin_page_title() in ...//wp-admin/admin-header.php on line 12
My blog is running on MySQL 4.0, phpMyAdmin 2.7.0.