Had a working Mac Build going until yesterday. Now, the Mac agent shows as (Limited) in the task bar, it's impossible to launch a simulator, and it no longer sees physical build devices attached to the Mac. Spun up a second Mac to test if the problem was Mac-based (a MacBook Pro also running Mac OS 10.12.4, latest XCode and Xamarin Studio installed). Same result.
How might I go about resolving this? I don't see a way to get more details on what the trouble is from Visual Studio...