Cannot add Server 2012 to existing 2003R2 DFS namespace

When trying to add a new server 2012 standard server to our domains DFS namespace which was created on a 2003R2 server (so is a 2000 based DFS) we get the following error

\\domain.local\dfs: The namespace server \\2012SERVER\DFS cannot be added. The server already hosts a namespace. You can host multiple namespaces only on Windows Server 2003, Enterprise Edition or Windows Server 2003, Datacenter Edition.

This was somewhat confusing since the server did not host any other namespaces and I had just added the same namespace to a 2008R2 server a month ago. The resolution ended up being to just go to one of my 2008R2 machines and add it from there and I was then able to manage everything else from the 2003R2 machine.

SharePoint 2013 logging in with wrong user name

There is (as of release) a bug with SharePoint 2013 that will log users into SharePoint using an incorrect account if you map a drive as a user name other than yours through the SharePoint design manager interface. This issue will persist even after disconnecting the mapped drive. It will also continue to be a problem even if you re-enable the log in as another user ability in SharePoint. It will show you are logged in as the correct user but will actually use the mapped credentials. To fix the issue you need to remap the drive with the correct username and password.