Mac OS X Lion v10.7.2
Xcode v4.2.1 Build 4D502
gcc version 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.1.00)
GNU gdb 6.3.50-20050815 (Apple version gdb-1708) (Th
I had this issue as well. Deleting the app from the simulator (In the simulator do Hardware -> Home, click + hold on app icon till icons jiggle, click the x just like you would do on a device). Running again used the correct images.