Instruments does not work on XCode 4 with device

Question

Until very recently, instruments worked fine. I don\'t know what I did to make it mad, but now it won\'t attach to any device that I try to Profile with; no device at all. I

Answer 1

I quit Xcode and Instruments, relaunched them, did a clean build, and then did Product->Profile, and Instruments magically started working again with my device. Go figure.