iOS Simulator not working OS X Mountain Lion

[Sebast3]

I have installed Livecode 5.5.2 as well as the latest xCode , i also can choose between iOS 5.0 Simulator and iOS 5.1 , but when i click "test" the Simulator opens but stays black and i get the error "could not start simulation". I have also tried very simple apps with just a TextField but it simply does not work , i hope u can help (The Simulator is working fine with xCode Testing)

[NigelS]

I get the same problem, however if you leave it long enough it then comes up with the app thou this happens randomly,