I actually had a weird bug for quite some time.
After finding the "obscure file" and opening it I was given a password,
but the password I was given was rejected repeatedly.
After about half an hour of exploring the web I tried again, and was given a new password which was accepted.
I do not know if this is a known bug, or if I confused the site by waiting to long and being auto-logged-out, and then accessing pages through my history that I was not authorized to be in, or if perhaps the "obscure file" was updated before the script accepting passwords was updated, or the password it checked against was updated.
Anyway, by exiting out of my browser (firefox 3), going back in, logging in again, and then redoing the entire exercise I was able to continue. Hope that helps some people who get stuck.