Storyline course randomly getting "stuck"

I didn't have any luck getting the screencast. I sent the link provided to a few people who were having problems but they couldn't get it to work. I have screenshots. A new problem that has been reported to me is that the player seems to lag behind the screens or something. For example, I was just sent a screenshot where on a question slide the Prev. and Next buttons were there, but wouldn't work. They should see the Submit button but it wasn't there.