We have become aware of this issue and are working towards a solution. Here are a couple workarounds for the short term:

-simply refresh the page to reload it (instead of hitting the back button)

-When you begin the lesson, the notation will have a "Pop-Out" button in the upper right corner of the notation screen. Click that to pop-out the notation in a new window. then, below the video screen, click the "Show Notation" button. You can then go back and forth between the auto-scroll feature and the regular sheet music.

Thank you for your patience!