[horde] public Key - adressbook error with 5.1.1

[pillul]

Hey Guys,

after the upgrade i have a major problem:
i use a shared adressbook where all public pgp keys are stored.
I can send mails to "old" contacts entered before the update.

If i try to send a encrypted message to new contacts, added after the  
update i get a error message.

"public key could not be read"


  SHOW FIELDS FROM `turba_objects` [pid 26291 on line 558 of  
"path/to/htdocs/pear/pear/php/Horde/Db/Adapter/Base.php"]
2013-07-22T13:48:55+00:00 DEBUG: HORDE [imp] PGPpublicKey: Verbindung zum  
öffentlichen PGP-Server fehlgeschlagen [pid 26291 on line 248 of  
"path/to/htdocs/mail/imp/lib/Crypt/Pgp.php"]
2013-07-22T13:48:55+00:00 DEBUG: HORDE [imp] PGP-Fehler: Öffentlicher  
Schlüssel für mail at adresss.com konnte nicht gelesen werden. [pid 26291 on  
line 27 of  
"path/to/htdocs/pear/pear/php/Horde/Core/Notification/Handler/Decorator/Hordelog.php"]

please help!