Freezes on iPad 1 v 5.1.1

Previous version (0.10.x) ran fine with infinite worlds turned off. Updated to 0.11.1 on 6/30/2015. Now the game freezes within about 10 seconds of loading, regardless of what I do. Freezes on menus or even the splash screen if I do nothing. Haven't gotten far enough to load a world before it just freezes. Completely unplayable. Requires pressing the iPad home button to exit and restart.