I'm also experiencing lock ups with the newest version of the roster.  Version Beta 0.1.9 runs just fine. Version 0.2.1 locks my game up.  I first noticed this when running pitching drills.  When the drill finished and attempted to save, the game locked up.  When 0.2.1 was set a default roster, the game would lock up on start up. Again I have none of these issues with 0.1.9.  I hope this helps.