I broke Jaguar again (and have done several times since this post).

I’ll quote it here for people too lazy to click the link:
Did I just break Jaguar? If I type an incorrect password while trying to log into Jaguar, it turns off the user interface totally and dumps me at UNIX login prompt. I can return to the login window simply by pressing Ctrl-D, but I how do I stop it from turning off the Aqua window manager?

Is this a known bug? Am I the only person capable of reproducing this?