XCode 4.4 iOS 5.1 Simulator problems

Question

i updated my mac book to mountain lion and Xcode to the 4.4 version. In the pre version I had no problems with closing the iOS simulator and Xcode stopped automatically the building process but now if I close the iOS simulator the build process in Xcode is still running and I have to force quit Xcode because it freezes.

Does anyone recognize this bug, or can you help me to solve this problem?

Answer 1

As a workaround, I've noticed that Running (⌘ + R) and then Bulding (⌘ + B) product succesfully starts new simulator instance, although the old instances are still frozen.