STATUS: Begin game button issue resolved (but see notes)

 I added a couple of log messages and try catch blocks where the null references were occurring, seemingly related to updating the score. Maybe I'm not quite understanding what objects (Views, Fragments) are available when as the system generates some nasty null reference Log messages when pressing the Begin Game button after an orientation change. I'm not holding a reference to any pre-configuration change View, so I don't know what the problem is. But, it doesn't crash seems to work fine.

 Note to self: try turning on the ScoreBarFragment.onRetainInstance property again?