@macbookandrew - we’ve locked this topic because too many people were jumping onto it with different issues. But someone else has reported a very similar issue to yours on a MacBook Pro ( No Playback on MacBook (loud click instead) - #3 by kmarty ). You may be able to fix the problem temporarily by playing a file twice in QuickTime, or by going back to Audacity 2.0.3 .
If you or anyone else still has the click instead of playback, please go to No Playback on MacBook (loud click instead) - #3 by kmarty and view the latest posts there or add your comment there.
Gale