I just updated Xcode to version 4.3 via the Mac App Store last week, and discovered that I can no longer debug on iOS 3.x devices. I have the iPhone 3G running iOS 3.1.3 and a 1st Gen iPad running iOS 3.2.

On both devices it appears that Xcode 4.3 installs the app and attempts to launch the app. The app displays the splash screen but never completes booting. There are no error messages or messages of any kind in the debugger output window. My only clue is when I press the pause button I can see that the device/Xcode is stuck in the following function: addimagesToAllImages which appears to be related to Apple's DYLD.

Debugging works fine on iOS 5 devices and worked on the previous Xcode 4.2 installation. I've rebooted my Mac, iOS 3.x devices with no change in behavior including clearing out all cache(s).

Anyone have any ideas as to what's going on? Thanks for the help.