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I was following the Intro to Xamarin.Android online class. At first, everything worked just fine (created a new project, was able to modify the designer, etc.) Then, in the middle of Lab 1, I ran into technical problems in VS2013: "Disconnected from layout renderer". Now I see this problem in all my Xamarin.Android apps, including newly created ones. Even after upgrading to the newest version of Xamarin (includes Android: 4.12.1). Even after restarting the computer.
This issue is also occurring in Xamarin Studio as well.
Since the last update to Xamarin.Android (4.12.1) I get this for all layouts. So basically the layout editor is now totally broken!
*** This bug has been marked as a duplicate of bug 18193 ***