I\'ve just downoaded a VS 2012 along with ASP.NET 4.5 and MVC 4.0 and was kicking the tires with a sample app and found that the forms authentication that works perfectly wi
For me, I had an issue because there are some changes to the web.config settings you need (from http://www.asp.net/whitepapers/mvc4-release-notes)
Fixing these settings (which it doesn't look like you've added) got things working for me when I had login issues.