Xcode 4 hangs at “Attaching to (app name)”

Question

I just upgraded to Xcode 4 and for some reason my app won\'t run in the simulator or iOS device. It was working perfectly in Xcode 3, but all of a sudden now when I press ru

Answer 1

Here was our fix:

In Project > Edit Schemes > Run.

Change the Debugger from GDB to None (directly above the green circle in the image above).