I like this app, but I recently did a check point 2 or 3, and I went to listen to things and nothing played when I got the button, so I had to just guess an answer at random. This is a very serious error that needs correction if people are to be properly assessed. Update, I'm on a lesson and now it won't advance due to an error and glitch, so the app is unusable after signing up for a year. I will try all the steps to fix it, but this is concerning.☹️