It is a simple as that I installed glimpse following this page. :
http://getglimpse.com/About/QuickStart
I then attempt to navigate to http://myApp/glimpse
http://myApp/glimpse
I encountered the same problem and in my case the solution was to add the following code to Application_Start() in the MvcApplication class:
routes.IgnoreRoute("{resource}.axd/{*pathInfo}");