That is all due to this change. You can fix that by changing your bookmarks though. For example if I come to www.armorama.com I am not logged in currently. When I get the login window it redirects me to armorama.kitamker.net (where I am logged in) and then hopefully back to the page I was trying to access. So yeah it's a bit clunky if your bookmark isn't set to the *.kitmakaer.net version of the site.
Thanks, Jim. The armorama.kitmaker.com login works as you described compared to the armorama.com's login.