Let my iMacPro update itself to macOS 10.13.4.
Now none of the instrument tools work for iOS. E.g. using Time Profiler -- tool thinks it's working, app runs, but nothing but a ticking timeline and zero reported stats. MetalSystemTrace does the same.
Have tried devices iOS9 -> iOS11 and iPhone6 -> iPhoneX. I'm completely dead in the water.
I haven't bothered putting in a Radar, as "Tools don't work" doesn't get much attention.
Hints on how to shake this loose? How do you force xCode to do whatever setup it performs when you first launch a new version?
cheers - j