I have been having this Xcode problem for a couple of months where my iOS simulator stops working whenever i run any application on Xcode and says, \"The simulated application q
This worked for me: http://www.colinbowern.com/posts/the-simulated-application-quit
I just deleted the folder "6.1" under ~/Library/Application Support/iPhone Simulator
The I just launched again the app and the simulator recreated correctly the 6.1 folder.