The recent updates have incremented version numbers 3.0.0.0 -> 3.0.0.1 and 4.0.0.0 -> 4.0.0.1 I had to remove the reference and re-add (System.Web.Mvc is found in Assemblies >Extensions are of the Add Reference dialogue)
Holy crap, thanks to @Nevada-Williford for the hint. Going in and setting my System.Web.Mvc reference to <Private>True</Private> (Copy Local = True) fixed it. Note, that before the update everything was working, after the update I had to modify my csproj to get it working again. Working theory on what’s going on: Copy Local = True … Read more
The best solution is update DLL to version 4.0.0.1. Try use nuget: Install-Package Microsoft.AspNet.Mvc -Version 4.0.40804 -Project <your project name> This will automatically update <dependentAssembly> <assemblyIdentity name=”System.Web.Mvc” publicKeyToken=”31bf3856ad364e35″ /> <bindingRedirect oldVersion=”0.0.0.0-4.0.0.1″ newVersion=”4.0.0.1″ /> </dependentAssembly> You just have to edit version System.Web.Mvc manually in: <compilation debug=”true” targetFramework=”4.0″> <assemblies> <add assembly=”System.Web.Mvc, Version=4.0.0.1, Culture=neutral, PublicKeyToken=31BF3856AD364E35″ />