I will click the app and it will open to a blank screen and the crash. I've tried everything from turning the device on and off to turning wifi on and off. All other apps work except imessage? Thanks
iOS: Troubleshooting applications purchased from the App Store
Contact the developer/go to their support site if only one app.
Restore from backup. See:
iOS: How to back up
Restore to factory settings/new iPod
Retrieving data ...