I am having the same issue but am also unable to reinstall 3.3( for some reason my ftp credentials wont work in WP so I have to manually reinstall). I get similar errors to the ones above.
Warning: require(/services/websiteos/wordpress/wp-includes/class-wp-editor.php) [function.require]: failed to open stream: Permission denied in /services/websiteos/wordpress/wp-includes/general-template.php on line 1808
Warning: require(/services/websiteos/wordpress/wp-includes/class-wp-editor.php) [function.require]: failed to open stream: Permission denied in /services/websiteos/wordpress/wp-includes/general-template.php on line 1808
Fatal error: require() [function.require]: Failed opening required '/services/websiteos/wordpress/wp-includes/class-wp-editor.php' (include_path='.') in /services/websiteos/wordpress/wp-includes/general-template.php on line 1808
I'm having trouble determining if this is a permissions issue or if the file path is incorrect. Anyone running into the same thing?