I'm a 'casino geek' on iOS; DoubleDown and DoubleU are both broken. Both crash the OS, springboard rarely, usually a full reset of iPad (Pro, 9.7"), where I have to renter my password 'reset'. Other 'big' casino games; Big Fish, GSN and most of the 'Viva' and associated games work great. I'm dealing with a real PITA issue with Double Down, and if you play these apps, don't try Betas!!