This is an update I sent you in your support ticket:
"Visual Studio 2013 and .NET4+ Full Profile are supported as of Telerik Reporting Q3 2013. In case you are using Entity Framework 6 in your projects, please test installing Telerik Reporting Q3 2013 SP1 version 188.8.131.52 and upgrade your project.
Please, let us continue the discussion there until we resolve the issue.
New HTML5/JS REPORT VIEWER with MOBILE AND TOUCH SUPPORT available in Telerik Reporting Q3 2013! Get the new Reporting version from your account or download a trial.