Signed Mac App's "Running" but not running (XCode 4)

I just moved to developing Mac Apps from iOS apps. I create even the most basic apps - run them - all is well. As soon as I add a Code Signing Identity (with c开发者_JAVA百科ertificate I created and have no problems with) - the app builds successfully, XCode says "Running " - but it never runs.

I tried cleaning, closing/reopening XCode, rebooting...

Any help will be immensely appreciated

UPDATE Ok - I've managed to figure out it's a conflict between Lion 10.7.1 (that doesn't support iCloud yet) and the provision that is set to enable iCloud As of Lion 10.7.2 the problem has been fixed

Adding a provision to XCode is not enough - I forgot to install the provision on the computer itself.

But in my defense - unlike in iOS/iTunes - there was no indicative message.