iOS 8.3 and 8.4, iPad Air 2
I've played 2 different vaults, now. I've experienced so many bugs, it's hard to list them all:
* Lost lunchboxes on crash -- this was the big one that I went to Apple customer service for reimbursemant
* Permanent "bad mood" in rooms where someone has died but either been recovered or removed (destroyed the room and rebuilt it)
* Permanent pregnancy (haven't found a way to fix this)
* Unselectable characters, rooms or menus (need to restart game)
* The first vault I played crashed every 5-10 minutes before I restarted the device. Now I just quit out and kill the game by hand if I'm playing for very long.
I'll be waiting for a patch before playing any more. If I ran into the unkillable raider or roach bug, I'd be pretty pissed. It's a fun little timesink when it works, but it needs a lot of love.