The downloaded sessions work fine. However, I switched to the online sessions where I had not downloaded them. The opening screen comes up with the play button in the middle. When this is touched the picture simply drops off the bottom of the screen and then just as quickly reappears. However, this pattern simply repeats and the introductory lesson never starts. Whenever sound is required in the session, nothing happens. The dialogue just never starts, no action as well as no sound. There is a red loudspeaker sign in the middle but no sound. In the conversation, the recording works, but there is no sound. The rest of the workouts are fine.