iOS Simulator and Instruments freeze

Question

I'm trying to do an iOS app and when I press CMD+I to launch Instruments to check for memory leaks the simulator freezes after a couple of gestures and so does Instruments.
Sometimes after a minute (or more) it works, but it's driving me nuts :(

I have Mac OS Lion and Xcode 4 (Lion version downloaded from Apple's dev portal).

Please help!
Thanks in advance!

Answer 1

Try the fix from here: Bug with starting Instruments via Profile under XCode 4.1 Build 4B110

Basically, after Instruments starts your app, Command-Tab to Xcode and back. I had the same problem but this fixed it.