OK, never mind 
I took a punt that something on the Mac side might be out of date and after updating the OS and Xcode to the latest versions, everything’s working fine again. I guess the Xcode version requirement in 4.11 has changed.
OK, never mind
I took a punt that something on the Mac side might be out of date and after updating the OS and Xcode to the latest versions, everything’s working fine again. I guess the Xcode version requirement in 4.11 has changed.