I just upgraded to XCode 6.3.1 and my app runs fine on all of the 8.x simulators, but not on my device, which was also upgraded to iOS 8.3. The app won't even load on the device (iPad 2).
I need to test my camera code (which also stopped working for the app's users). Any ideas on how to fix this? (already did a project->clean, stopped and restarted XCode and the device).