For reference please see: System.Web.Mvc not functioning as expected after Windows Update
I managed to fix all references in Web Projects with above link. However in class libraries where I am referencing System.Web.MVC 4.0.0.1 I still receive the error: The name 'ViewData' does not exist in the current context
I can see the correct DLL being referenced in the solution explorer - when looking at the properties it is set to 4.0.0.1.
Any ideas ?