[Lynne]

You can try disabling your plugins to see if it's a modification causing the issue.
Note: To temporarily disable the plugin system, edit config.php and add this line right under <?php

PHP Code:

define('DISABLE_HOOKS', true); 


If it's not that, then I'd suggest reuploading your original vbulletin files because maybe one of them was modified incorrectly and has removed the footer eval code.