It's tough to know what's going on based on your description, so I would start by asking whether you're on iOS or Android.
- If iOS, you can run the app in Xcode and you should get some logging on the console.
- If you're running Android, you can run "adb logcat | grep CONSOL" and then start the app in another shell; that should give you some good logging. If that doesn't give enough info, try it with just "adb logcat".
Let us know how that works for you. My feeling is if the app is not starting, it would not be because of the push notification stuff.