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On Windows 8.1, the user is prompted to install .NET Framework 3.5 which breaks the iOS project in Visual Studio.
Steps to reproduce:
1) Install Windows 8.1
2) Install Visual Studio 2012
3) Install the latest Xamarin.iOS for VS (1.8.365)
4) Check to see under Windows Features if 3.5 is installed. It will not be.
5) When you select an iOS project as the Startup Project, the user is prompted with the following dialog: http://screencast.com/t/onk1y9oJNa
6) Install 3.5 as prompted by the dialog.
7) The project will fail to run, debug or deploy.
8) Navigate got Windows Features
9) Uncheck the .NET 3.5 feature, deactivating .NET 3.5
10) Return to Visual Studio and open your iOS project.
11) Select "Set as Startup". This will display the dialog again from step 5. Only this time, select "Cancel"
12) The project will run, debug or deploy.
Visual Studio 2012
.net 3.5 no longer supported