Menu Not Shown when Header Sidebar Wigget is used

Hi, On a new install- WP installed , Catch Kathmandu Theme activated, and When the Header Right Sidebar is used the Default Menu is no longer shown. Creating a new menu and it seems to fix it, but when viewing on a mobile device that newly created menu disappears. Here is a test site I've rattled my head with :) http://pi.x10host.com/catch-kathmandu/ Cheers' Pete