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After creating a simple PCL project and adding System.Threading.Tasks as reference, unable to run the PCL projects on Visual Studio 2012. Test project replicating the issue is attached. The project works fine on Mac, under Mono 3.2.1 Runtime.
Versioning information for Windows 8 PC:
Microsoft Visual Studio Ultimate 2012
Version 11.0.60610.01 Update 3
Microsoft .NET Framework
Installed Version: Ultimate
Visual C# 2012 04940-004-0038003-02429
Microsoft Visual C# 2012
Windows Phone SDK 8.0 - ENU 04940-004-0038003-02429
Windows Phone SDK 8.0 - ENU
NuGet Package Manager 2.7.40703.191
NuGet Package Manager in Visual Studio. For more information about NuGet, visit http://docs.nuget.org/.
Xamarin.Android 4.8.01013 (b76e8ec4)
Visual Studio plugin to enable development for Xamarin.Android.
Xamarin.iOS 1.3.250 (49348a51)
Visual Studio extension to enable development for Xamarin.iOS
Closing ancient bugs, please reopen if you're still having this problem.