I have my six Icon.png - [email protected] files in my project and they are listed the same way in my plist just like I have read. My icons show up when I run my app in the simulator, but not when I run it on my device.
I am using xcode 4.5.2 and am running the apps on my iPhone 4s.
@Fernando Mazzon 's long shot has helped me. In my case I have renamed jpeg into png with this problem occuring. After I choose to export jpeg to png(this time for sure it is png), it works just fine :)