Big problem with multisite and content that is only shown when logged in

Hi guys again i have a very big problem with my multiste installation and the content that is only shown when i am logged in! Have a look at this site: http://bgt.oestreich.net/
the header and the second language flag is only loading when i am logged in, when you put a /en/ behind the adress you can see the englisch translation. I had the same problem a few days ago when i changed the domain mapping. Is there something i have to look at or is something wrong with my installation? Please help me. When you are logged and then log out in some times the flag will show up but it seems only in the cache on other browsers and machines it will not show! Please have alook at the domain mapping or the settings of the webiste. i have granted webiste access over the wpmu dev tool