Visual Studio 2012 Bug?
I don't know if this is a bug or not, but when I did your instructions on page 43 of adding the master page, the code for the masterpage popped up on the solution explorer area of Visual Studio and the solution explorer disappeared. I then clicked on the x at the tab for the code for the master page that was covering over the solution explorer and then the solution explorer popped back up again. Strange. Anyhow just thought you might like to know.