redirect not working

Hi,
I am following this tutorial below and I dont get an error but what happens is that when i login
I get redirected to the wrong place, explained below

cakephp/posts/index   -correct and I get redirected here sometimes
cakephp/   - other times I get redirected here with same login name

 
http://book.cakephp.org/2.0/en/tutorials-and-examples/blog-auth-example/auth.html


class AppController extends Controller {
   
 public $components = array(
    'Session',
    'Auth' => array(
        'loginRedirect' => array('controller' => 'posts', 'action' => 'index'),
        'logoutRedirect' => array(
            'controller' => 'pages',
            'action' => 'display',
            'home'
        ),
        'authorize' => array('Controller') // Added this line
    )
);
///
class UsersController extends AppController
{
public function login() {
    if ($this->request->is('post')) {
        if ($this->Auth->login()) {
            return $this->redirect($this->Auth->redirect());
        }
        $this->Session->setFlash(__('Invalid username or password, try again'));
    }
}

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