Very rarely on game start (or when returning to app from lock screen, home, or another app) on-screen colors will be displayed incorrectly.  Generally, blocks will appear “purple and black” and “resembling a checkerboard”.  This appearance issue affects blocks and inventory screen (I.e. actual gameplay) but not titles and menus.  Leaving the app again and returning resolves the issue. Will attempt to post a screenshot if this recurs.  Thanks.