So I'm going to answer my own post... I just tried fully quitting iReal b by killing it in the mutitasking menu ribbon (double-tap button on front of iPad, hold any app icon till they all wiggle and show red minus icons, click on minus icon to kill app.) I then launched iReal b anew and everything worked fine (including the buttons at the bottom of the player showing up in landscape mode.)

I will report if I get this crash again.