I'm not sure where the breakdown is happening, but as of yesterday I can no longer see ANY devices in the Android Target Device DDL. I've gone as far as to uninstall and reinstall Xamarin, but it doesn't seem to have made any difference.
What do I need to do to get it back? Right now I'm doing all my coding in VS and then using Xamarin Studio to deploy to my Nexus 4.
Also, the Emulator Manager does have definitions that I was previously using, and as I said, I AM able to deploy to my Nexus 4 and Nexus 5 from Xamarin Studio running on the same VM.