existed for quite a while. It isn't a bug, it's supposed to happen. When you get a page telling you to login, it uses that redir variable. You can also set it as a cookie (I think), because it probably uses the $_REQUEST array.
Wow...that's just sad. Yet when I run it on windows 2000, the OS isn't supported or something. Just tried it on my Ubuntu box with crossover and I apparently have genuine windows too.