Just found an issue when trying to run Dapp on iPhone devices running OS 3.1.3 and earlier. Thank you to the user that reported the bug.
To our fellow developers out there, conditional statements on running OS 4.0 specific code is probably a good idea .
This patch is now in review with Apple.To your app success!,
P.S. Technology is only a small part of your app success. There is the business, sales and marketing that you need to think of too :). Which is why I also provide a bunch of free education on how to succeed on the App Store - http://kerofrog.com :).