Hi. Fiddeling with com.apple.systempreferences.plist and com.apple.Safari.plist, (deleting) deleting all StartUp Items from the control panel, log out and log in as different user: Safari loaded the web page in english. restarting and log in into my user account: Safari still works: web page still in english. I don't know what did the trick but it works now. Many, many thanks to all for the nice help! Greetings, Robert