IOS app rejected due to a blank, black screen upon launch

I recently got my iPhone app rejected and the reason is below:
"We found that your app exhibited one or more bugs, when reviewed on iPhone 5 running iOS 6.1.3, on both Wi-Fi and cellular networks, which is not in compliance with the App Store Review Guidelines.
Specifically, the app displayed a blank, black screen upon launch. Please see the attached screenshot/s for more information.
The steps to reproduce are:
1. Launch app
2. Bug encountered"
I use FlashDevelop and the latest Apache Flex + Air SDK 3.7 + swfversion=20. I don't have an iPhone 5 to test on but I've tested the application on a 3GS, iPod touch (4th gen.) on IOS 4.3, 5.1 and 6.1.3 (latest) and the application works on all of them.
The attached screenshot mentioned above is here:
the "blank" screen is actually a deep blue one, which the color I've set to my project's background.
I didn't make any special modifications in the code to support iPhone 5 to be honest, and the project dimensions were set to 640x960, but I did include the [email protected], and it shows inside the .ipa at Payload/Myapp.app/
In almost all the iPhone 5 discussions I've read online, theat launch problem is due to the [email protected] not being there in the root of the release .ipa, but I'm sure it does exist on my ipa. Also, I have request high resolution set to high, and the Info.plist has the correct DTPlatformVersion (6.0) and DTSDKName (iphoneos6.0).
Any ideas what the problem could be?
Thanks.

Remember - they gave you a very specific device and version. It might be working on all other configurations. So if you are unable to get your hands on that device and version you are going to be left stabbing in the dark as to what is going wrong.
My advice would just be to figure out what's different with that device and make sure everything is configured properly.
Another option - if you don't want this app on the iPad anyway - is to remove it from the configuration:
<key>UIDeviceFamily</key>
<array>
          <string>1</string>
          <string>2</string>
</array>
You would delete the <string>2</string> part.

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