Auth->authenticate in beforeFilter causes Auth issues

Right now I'm using Cake's Auth component to build a simple user
system. Pastes of the files in their entirety are available
http://gist.github.com/136935 for reference.

The problem is that when I call: $this->Auth->authenticate =
ClassRegistry::init('User'), login.ctp always shows "Login failed.
Invalid username or password." even when I haven't submitted anything.
If I uncomment that line (line 10, users_controller.php) the message
is suppressed but the login logic doesn't work, because it needs the
hashedPasswords function in the User model to get the proper password
hash. We need to use plain md5 hashes instead of Cake's regular hash
because before converting to Cake all of our users just had plain md5
hashed passwords.

The strangest thing is that this happened before, and was solved by
getting rid of all the relevant code, and then completely rewriting
it. After the rewrite, it worked for a while, and then I must have
done something to break it again. Can anyone see what is wrong? Am I
doing something dumb and just not realizing it?

Thanks for any help.

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