What do I do if I don't get any sound in playback?

When I attempt to record a test question, everything seems to be working, but when I attempt to play it back, there is no sound.

and

When I press the record button nothing happens.

It's possible that the setting that gives Audio Exam Creator access to your microphone is disabled. 

Do this:

(1) Go to Settings -> Privacy -> Microphone. 

(2) Make sure that Audio Exam Creator is allowed to access the microphone.