Bug? - Tabs missing

1 - admin/people >> user profiles: No tabs are displayed for User Admin (Aristotle only >> they display correctly in Seven). BUT, if you go to the URL of a tab, e.g. /user/id/nameof_profile, the proper page is rendered in aristotle theme. in other words, where's the tabs? this blocks role-based profile admin. 2 - admin/content: tabs display in aristotle for the admin role only. Non-admins see an (ugly/non-intuitive) unformatted list of links, should be tabs.