My student is having a problem with this lesson as well. When he tries to click on a sprite to edit it, it won't open. The normal tool bar is truncated and can't be accessed. When he deletes a sprite, and refreshes, the sprite is still there. We have logged out and back in, refreshed, changed lessons and come back. The problem is there for any of the activities in lesson 3, although it didn't start happening until activity 16 in this lesson.