Blank screen on launch of phonegap app on old versions of android and iOS
After much investigating, I discovered the cause of this issue.
My app container had the same id as the object I had created
Once I ran the app in xCode and debugged it in Safari, it appeared older versions of iOS and Android (more likely older versions of PhoneGap) didn't like that I had called the instance of my app object "app" and had also called the div that it was rendered into "app".
Try changing the name of the div and see if it works!