There's an update on the Apple App Store for the Smart Remote App and it fixes the crashing problem on both my iPad and iPhone. Everything looks to be back to normal again!
Same thing been happening to myself as well for the past few days. iPhone 6, iPhone 5 & iPad all do the same thing - app starts then quits to background. I've also reinstalled the app and even restored my iPad just for giggles. But nothing. Checking...