[imp] could not read a mail in a search result folder

[LALOT Dominique]

Hello,

I have that last imp version 5.0.4
Search is working, but when I click a mail, I get a mailbox does not exist.
Running tshark, I observe:
I am faily sure, it was working before in 5.0.x. Any ideas?

62.362616 139.124.132.126 -> 139.124.132.191 IMAP Request: 6 *SELECT
"impsearch\000dimpqsearch"*
 62.402223 139.124.132.191 -> 139.124.132.126 TCP 13105 > 60710 [ACK]
Seq=22839 Ack=166 Win=5888 Len=0 TSV=897312804 TSER=35639150
 62.402249 139.124.132.126 -> 139.124.132.191 IMAP Request:
 62.402405 139.124.132.191 -> 139.124.132.126 TCP 13105 > 60710 [ACK]
Seq=22839 Ack=168 Win=5888 Len=0 TSV=897312804 TSER=35639154
 62.402963 139.124.132.191 -> 139.124.132.126 IMAP Response: 6* NO Mailbox
does not exist
*
my backend:
$servers['advanced'] = array(
    // Disabled by default
    'disabled' => false,
    'name' => 'U2',
    'hostspec' => 'imap.univmed.fr',
    'hordeauth' => true,
    'protocol' => 'imap',
    'port' => 13105,
    'secure' => false,
    'maildomain' => '',
    'quota' => array(
        'driver' => 'imap',
        'params' => array(
            'hide_when_unlimited' => true,
            'unit' => 'GB'
        )
    ),
   'admin' => array(
        'params' => array(
            'userhierarchy' => 'user/',
            'protocol' => 'imap/notls',
            'hostspec' => 'imap.univmed.fr',
            'port' => 143
        )
    ),
    'acl' => true,
    'cache' => true,
);


-- 
Dominique LALOT
Ingénieur Systèmes et Réseaux
http://annuaire.univmed.fr/showuser.php?uid=lalot