No Devices Attached for iPhone & iOS Simulator

As the title states, since updating, I can no longer test on any device. I've tried rolling back versions and can no longer find a proper combination that works, so this has become a really urgent issue for us. I have tried repairing, rebooting, restarting, and reinstalling several versions. Current versions listed below, everything is fully up to date.

Build Host -
Xamarin.iOS -

Xamarin -
Xamarin.iOS -

Running Visual Studio 2013 on Windows 8.1
Build Host lives in OS X 10.9.5


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