Flashdata don't show up

Hello everyone,

I am having issues with flashdata. For some reason any of them won't show up. 

I am setting it like this:

Code:

// Controller
$this->session->set_flashdata('user_registered', 'You Registered Successfully!');
redirect('/'); // redirects to the index page (login page)

Code:

// View
<?php if($msg=$this->session->flashdata('user_registered')): ?>
  <?php '<p class="alert alert-danger">'.$msg.'</p>' ?>
<?php endif; ?>

I have tried 'keep_flashdata' but doesn't seem to work.
These are the configurations:

$config['sess_driver'] = 'files';
$config['sess_cookie_name'] = 'ci_session';
$config['sess_expiration'] = 7200;
$config['sess_save_path'] = NULL;
   // $config['sess_save_path'] = sys_get_temp_dir();
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 300;
$config['sess_regenerate_destroy'] = FALSE;

$autoload['libraries'] = array('database', 'email', 'form_validation', 'session');

Any help is very appreciated. 
Thank You!