I am using (http://wordpress.org/plugins/download-monitor/) but in the admin when trying to use the insert download into post option this fails.
Traced the problem to Simple Links (2.2.0 and 2.2.4).
Switched off the plugin and the insert option worked again.
In FireBug I can see following error:
TypeError: $s(...).sortable is not a function
Hope you can fix this. Thanks!