If I click on the little speaker symbol on the Lernkartei I can’t hear anything. I can’t hear anything if I click on this symbol in the whole platform but there is audio output if I download the mp3 files. Is anyone out there who knows how to fix the problem?
I figured it out by myself. It was the Adobe flash one click Firefox plug in. It was deactivated by Firefox automatically and I had to update it.
@Berenike - Ah, glad you figured it out. Often the first place to check is with Flash.