ShimNotImplementedException after upgrading Visual Studio 2013 and Microsoft Fakes v12

We are utilizing Microsoft Fakes with Visual Studio 2013. After updating to Visual Studio 2013 Update-4 or Update-5, we are getting ShimNotImplementedException's in our tests.

We have followed instructions found in other SOF questions and turned off the SpecificVersion of our Microsoft.QualityTools.Testing.Fakes references. This allows a compile but the tests still fail when run.