Why is the picture / sound suddenly gone during the online seminar? 25 June 2021 12:51 Updated Close your Internet Explorer and log in again. Related articles Why can't I hear anything even though I’m logged into the online seminar? What steps do I have to take or observe before the online seminar? Why doesn’t the Klett Augmented App work? Why can't I play the audio files in the Klett Sprachen App? Why is there a limited number of participants in the online seminars?