Joomla 3.2 not load user info - joomla

Question

I use this code:
$usuario=getJoomUser();
$username=strtolower($usuario['username']);
$name=$usuario['name'];
if ($usuario['id']== 0)
{
echo "$name";
print "No estas logueado en el sistema";
}
else
{
The code works fine but not with some computers. Joomla load fine the user and his password but not my code in PHP. However, if I use that information in other computers works fine.
Any ideas?
Thanks a lot.
My function is:
function getJoomUser() {
error_reporting(1);
define( '_JEXEC', 1 );
define( 'DS', '/' );
define( 'JPATH_BASE', $_SERVER[ 'DOCUMENT_ROOT' ] . DS . 'Joomla3.2.3' );
if(is_file(JPATH_BASE .DS.'configuration.php')) {
require_once(JPATH_BASE .DS.'configuration.php');
} else {
echo "Could not locate configuration.php <br />";
}
if(is_file(JPATH_BASE .DS.'includes/defines.php')) {
require_once(JPATH_BASE .DS.'includes'.DS.'defines.php');
} else {
echo "Could not locate defines.php <br />";
}
if(is_file(JPATH_BASE .DS.'includes/framework.php')) {
require_once(JPATH_BASE .DS.'includes'.DS.'framework.php');
} else {
echo "Could not locate framework.php<br />";
}
if(is_file(JPATH_BASE .DS.'libraries/joomla/factory.php')) {
require_once(JPATH_BASE .DS.'libraries/joomla/factory.php');
} else {
echo "Could not locate factory.php<br />";
}
$mainframe = JFactory::getApplication('site');
$user = JFactory::getUser();
$userData['username'] = $user->username;
$userData['name'] = $user->name;
$userData['id'] = $user->id;
$userData['email'] = $user->email;
$userData['groups'] = $user->groups;
return $userData;
}
?>
I have tried with the option -->guest and the problem continues. The key is: That happens in some pcs and I try to sign in with these user's data in my computer or another computer works fine.
I tried without to call a function and remains the same.

Answer 1

I don't know where you got getJoomUser from but to get the user object, you need to use this:
$user = JFactory::getUser();
You can then do what you wish like so:
if ($user['id'] == 0){
print "No estas logueado en el sistema";
}
else{
echo $user->username;
}

Answer 2

I have update to 3.3.6 and the problem continues.
On Internet Explorer, activating compatibility view works fine. WRONG
I will change to drupal...
Thanks