We have an existing App in Itunes "Whinfrey Briggs Processing" which works on all versions of iPhone other than 6. The app is done in HTML 5 and was initially packaged up using phonegap.
You can see from this video that the app installs and briefly loads up before disappearing from screen. [url removed, login to view]
What it should do is send you to a login screen which is shown in the attached picture.
Initially we would like this to be fixed so it loads on the iPhone6