Dear Sir or Madam, my sister have the same problem in two different countries on two different Dell laptops. Both are running Windows 10 (64 bit), the latest Firefox (v47.0.1) and the latest Adobe Flash Player. The problem arises when we pause a playback and then after a while resume the playback. Then after a few seconds and sometimes after a few minutes the audio continues but the video is stuck. It happened for example with this video: http://www.zdf.de/ZDFmediathek/hauptnavigation/startseite#/beitrag/video/2773380/B%C3%A4ckersterben Oddly enough the same does not happen with MS Edge and Adobe Flash. Thank you for looking into this. - Frank