If I call webmethod from jQuery.Ajax with installed Nuget packages Microsoft.AspNet.FriendlyUrls v 1.0.2 and Microsoft.AspNet.Identity v.1.0.0., then I get the data object,
In your App_Start folder, within your RouteConfig....
Comment out the following line or change its RedirectMode:
//settings.AutoRedirectMode = RedirectMode.Permanent;