[imp] Show User quota

[T Test]

I repost an older questions:

I install a new version of Horde Groupware, ver. 5.2.22 with IMP 6.2.24.

This is a part of backends.local.php under/var/www/html/horde/imp/config

     ),
     'acl' => true,
     'cache' => false,
      'debug' => '/tmp/imp_imap.log',
      'debug_raw' => false,
     'quota' => array(
         'driver' => 'imap',
         'params' => array(
             'hide_when_unlimited' => true,
             'unit' => 'MB'
         )
The problem is that when user log in to hord don't show his user quota.

I try to modify the paramters in driver value setting imap, courier or 
hook but nothing.

All other files are correctly configured

Any suggestions? It is incredible.

Regards Pasquale.