I've upgraded our internal intranet site (on a test platform) from DNN 4.9.2 on Windows 2003/SQL Server 2005 to DNN 7.3.2 on Windows 2012 R2/SQL Server 2012 following the recommended upgrade path on the WIKI dated 4/7/2015.  Everything went smoothly, but now my auto-login via AD is broken.  Manual login is still functioning but not taking me to the "home" page of my site, but rather to the default DNN login page after processing my credentials via the IIS/IE pop-up credential box.  I can enter the credentials on the login page and it authenticates me a second time and then sends me to the Home page.  I've updated the DNN_ActiveDirectoryAuthentication module to version 5.0.6 and followed the configuration instructions (http://dnnauthad.codeplex.com/documentation) as well as other tips I've found in the forums.  Additionally, I don't see any errors in the site event viewer, just successful authentications.  I also don't get any errors or even the status display when modifying the AD settings in the DNN_ActiveDirectoryModule; it just returns me to the extension list page after clicking on the update authentication settings button.  I'm a newbie, non-website developer, system admin, to DNN and am at a loss as to what to try next.  My production site is currently at 5.2.3 (upgraded from 4.9.2) and works like a champ with AD and auto-login.  Any help would be greatly appreciated.