Instruments 4.1 unresponsive to projects launched from Xcode 4.1 until pressing Cmd-Tab

Strange bug is fixed in XCode 4.2!
The problem was the hidden password dialog, so sometime it works and sometimes not.
One of possible solutions was:

1. Run Instruments
2. Cmd Tab to Xcode covering the instruments. Cycle and hide messages until password dialog is found.
3. Close Xcode.

PS: I know it is a few years to late for the answer, I was just looking for unanswered questions. Just check as answered – > it’s good for both of us. )