Check in your developer tools if you also have this error:
Uncaught TypeError: Object [object Object] has no method ‘wpList’.
If that is your problem, you can fix it by adding:
<script type=’text/javascript’ src=’/wp-includes/js/wp-lists.js’></script>
in your /wp-admin/admin-header.
After do_action(‘admin_head’); did it for me.
Whatever order the scripts were being enqueued in was leaving wpList undefined, so I defined it higher up.
I’d flag this as an error in WP3.5.2, except I have another install that doesn’t have this bug. Does the theme affect which order the scripts are queued up in? I will see check and see, and try to move the change to a theme-dependent file instead. But this is the issue at least in some cases anyway.