Could not load file or assembly \'Microsoft.VisualStudio.Web.PageInspector.Loader, Version=1.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a\' or one of its depen
I removed the dll from gac and it started working. I am not sure where those dlls came from. If you have 2 or more versions of visual studio, reinstall the last version.