logins worked, now they fail

The site I'm working on had authentication working fine (it was one of
the first things I set up). but suddenly I find that they no longer
work. Auth isn't showing me anything helpful, and there are no SQL
queries displayed (debug => 2), just the usual DESCRIBEs.

Passwords were created using Security::hash($cleartext, null, true)
but, as I said, these were fine before.

I'm completely at a loss as to what's changed as I've been working on
all public stuff and haven't been logged into the site for awhile now.
Can anyone think of anything to check? I'm baffled.

AppController:

public $components = array('Auth', 'Session', 'Cookie',
'RequestHandler');

public function beforeFilter()
{
parent::beforeFilter();

$this->Auth->fields = array(
'username' => 'email',
'password' => 'password'
);
$this->Auth->loginAction = array(
'controller' => 'users',
'action' => 'login',
'language' => $this->Session->read('Config.language')
);

$this->Auth->loginRedirect = array(
'controller' => 'posts',
'action' => 'index'
);
$this->Auth->logoutRedirect = array(
'controller' => 'posts',
'action' => 'index'
);

$admin = Configure::read('Routing.admin');

if (isset($this->params[$admin]) && $this->params[$admin])
{
$this->layout = 'admin';
}
}

UserController:

function beforeFilter()
{
parent::beforeFilter();
$this->Auth->allowedActions = array('add', 'forgot_password',
'view');
}

public function login()
{
//debug($this->Auth);
}

If I uncomment the line above, I see:

[loginError] => Login failed. Invalid username or password.
[authError] => You are not authorized to access that location.

mysql> describe users;
+---------------+------------------+------+-----+---------
+----------------+
| Field | Type | Null | Key | Default |
Extra |
+---------------+------------------+------+-----+---------
+----------------+
| id | int(10) unsigned | NO | PRI | NULL |
auto_increment |
| created | datetime | YES | | NULL
| |
| modified | datetime | YES | | NULL
| |
| last_login_ts | datetime | YES | | NULL
| |
| admin | tinyint(1) | YES | | 0
| |
| enabled | tinyint(1) | YES | | 0
| |
| email | varchar(64) | NO | UNI | NULL
| |
| password | char(40) | YES | | NULL
| |
| name | varchar(64) | YES | | NULL
| |
| bio | text | YES | | NULL
| |
| display_email | tinyint(1) | YES | | 0
| |
+---------------+------------------+------+-----+---------
+----------------+

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