When I run Visual Studio in the Page Inspector it comes up with a warning
Some files gave changed and a new build is needed. Click here to build the project and refresh the browser. (Ctrl+Alt+Enter)
When I click there and answer No to stop debugging (even if i say yes, it kicks me out and brings me back to the same place so that isn't helpful) I get a message the "Visual Studio 2012 RC has stopped working" and an able to restart or debug.
I had a warning when I get to the page inspector page about the prerequisites are not satisfied. It starts out by saying the url must map to the project, so I'm not sure if the URL setup for the project doesn't work but I'm able to do everything else with it.
I added a reference in the appsettings of web.config to enable PageInspector.ServerCodeMappingEnabled, which didn't help. When I went to add a Reference I already had references for System.Web.Pages and System.Web.Pages.Razor so I wan't sure what I am supposed to reference and clicking the link to get details takes me to a blank page, but after the last round of changes the warning went away.
I am also using IIS Express.