We have an ASP.NET MVC 4 solution with a couple of references that has been building without problems for about 2 years now. However, after installing KB2993928 and KB2993937 th
Remove any references to System.Web.MVC and then re-add them by manually browsing to the dll (C:\Windows\Microsoft.NET\assembly\GAC_MSIL\System.Web.Mvc\v4.0_5.1.0.0__31bf3856ad364e35\System.Web.MVC.dll on our machine). A lot faster than re-installing MVC if this has just taken your production server down!