Hi, Since I upgraded my JustMock I was unable to debug ASP.NET projects. I accidentally found a resolution to the problem here: http://stackoverflow.com/questions/19415275/asp-net-mvc4-code-not-running "If you are using Telerik JustMock as a mocking framework and have recently updated it to the 2013 Q3 version, it causes this exact problem. I was able to resolve this issue by uninstalling the mocking framework and installing the 2013 Q2 version." So I uninstalled JustMock and everything came to normal. Regards, Ovidiu