Just upgrading some of my projects and am going to note some of the breaking changes for anyone else. Entity Framework System.Data.Objects.ObjectContextOptions //deprecated ContextOptions.DeferredLoadingEnabled = true ; //beta 2 ContextOptions.LazyLoadingEnabled = false ; Update: It seems the T4 template for the Self Tracking Entities was not updated with this change for the ContextOptions. Here is the Fix Just unzip and replace the following files. C:\Program Files\Microsoft Visual Studio 10.0\Common7\IDE\ItemTemplatesCache\CSharp\Code\1033\AdoNetEntityDataModelT4SelfTrackingCodeGenCsharp.zip\EF.SelfTracking.Context.ctp.CS.tt C:\Program Files\Microsoft Visual Studio 10.0\Common7\IDE\ItemTemplatesCache\CSharp\Code\1033\AdoNetEntityDataModelT4PocoCodeGenCSharp.zip\EF.Poco.Context.ctp.CS.tt Workflow When I opened up my Solution with a Workflow project it was unable to open it. It seems they have now added two new Workflow Project Types.