Since upgrading to Xcode 4.3.x, my archives of iOS app in Organizer don\'t have an icon. (I have icons on my Mac OS X apps though)
One app in particular is an iPad a
In your projects build phases turning off image compression solved this for me (it's either image or png compression, not at my computer to check) now this is a very strange situation because I haven't changed the way I format my images sense upgrading to 4.3 but during the app validation process I received an error telling me that my Icon.png wasn't 57x57 when it clearly was. I looked up how to solve this and turning off image compression was the fix... Which apparently made the icon show up in organizer too.... Weird.
Good luck!