I have resolved the problem with my brand new iPhone 5S.
Here is what I did:
- connected the iPhone 5S the machinse
- launched “Instruments” application from XCode (note: the GUI one, not the command line one!)
- chose my failing device (the iPhone 5s) and SafariLauncher as target for profiling template
- chose “automation” project
- clicked “choose”.
Either now, or after clicking “record” button a pop up appeared that asked me if I want to open XCode enable this device for development. Theoretically this makes little sense, as I did that already, I saw the “developer” menu in phone’s settings, I had the “Enable UI Automation” checked, provisioning profile uploaded… nonetheless I clicked “Yes”.
Xcode devices view opened and I did nothing there, although I saw some settings change in the device console’s output. I switched back to Instruments GUI, clicked “record” and SafariLauncher started on the device.
After that the phone started to work with the command line of the instruments too and I am able to run my tests on the device.
Seems that the device entered a state where “developer” options were halfway enabled, visible in the IOS GUI, toggable, etc but actually not working. Instruments GUI somehow detected and fixed it.
Hope that helps.