It turns out that weird things can happen when you mix Windows Server 2003 and Windows Server 2012 R2 domain controllers
http://blogs.technet.com/b/askds/archive/2014/07/23/it-turns-out-that-weird-things-can-happen-when-you-mix-windows-server-2003-and-windows-server-2012-r2-domain-controllers.aspx Put this one into your bag of tricks!
