This is technology.  Things happen from time to time.  Here are a few tips of things that students can try first.

Videos not working

Check the browser.  If a student gets stuck make sure they are using Google Chrome as their browser. Then try refreshing the screen.

Getting stuck

If a student gets stuck and cannot move forward, try logging out of the program, and refreshing the screen.  Then log back in.  If this does not work try clearing the cache and trying again.  If a student is still unable to move forward have them use the question box to identify the problem.  We will contact the technical team and make sure the issue is resolved.