Edited site url conflicts with Smush settings on sub-site

I am unable to access Smush within a child site unless I am logged-in as a super admin. This is only the case with a child-site that has a site url set to their own top level domain (required because of an SSL certificate) this leads me to believe that the edited site url setting is somehow interfering with whatever functions Smush uses to detect user permissions, and is therefore blocking access to its settings on that child-site