When you play a lesson, the software may hang or crash. In the case that the software hangs, you can’t exit the lesson unless you close the software via Task Manager or by restarting your computer. The most likely reason for this problem is that there is a codec conflict on your Windows operating system.To solve this problem, we suggest you try using the Audio Diagnostic Tool. For instructions on how to do this, please visit this article:

How to use the Audio Diagnostic Tool