I have installed vs2012 (11.0.50727.1), I opened a new MVC4 with .NET 4.5 solution, i create a simple HomeControl
vs2012 (11.0.50727.1)
MVC4 with .NET 4.5
HomeControl
Old post but if you encounter it prior to the mvc woes (System.Mvc.dll update e.g x.0.0.1) you could check the bindingRedirect tag(4.0.0.0 -> 4.0.0.1)