Cake Php auth problem


I have a problem with cake php built in auth - i cannot log in ...

1)user is added through app control pannel and hashed using $this->auth->password('xxx') - i've checked it's corrent in db

2)security salt is not emtpy

3) in action User/Login data['User']['password'] is empty (i don't know if this is correct but i've read that Auth remove content of data['password'] or data['User']['password'] - am I correct?

4) db has table users with fields username and password

After i'm trying to login $session->flash('auth') says:

Login failed. Invalid username or

but beforeFilter in AppController i've set

$this->Auth->loginError = 'No, you
fool! Thats not the right password!';

So what can be wrong? :(