Just loading one page now produces:
load.php:2 Uncaught ReferenceError: mediaWiki is not defined
i.php: 1262Uncaught ReferenceError: mediaWiki is not defined
i.php: 1263Uncaught ReferenceError: mediaWiki is not defined
load.php:2 Uncaught ReferenceError: mediaWiki is not defined
SlippyMapCassini.js:43 Uncaught ReferenceError: wgSlippyMapLanguageCode is not defined
jquery-ui-1.7.2.custom.min.js:10 Uncaught ReferenceError: jQuery is not defined
jquery.form.js:11 Uncaught ReferenceError: jQuery is not defined
i.php:1269 Uncaught ReferenceError: mediaWiki is not defined
plugins.combined.min.js:11 Uncaught ReferenceError: jQuery is not defined
Vector.combined.min.js:2 Uncaught TypeError: Object #<an HTMLDocument> has no method 'ready'
load.php:13 Uncaught ReferenceError: addOnloadHook is not defined
And the new hook should not be on the file level.
Version: unspecified
Severity: critical