[kronolith] Free-Busy URL does not work after update to Kronolith 3.0.17

[lst_hoe02 at kwsoft.de]

Hello

we have done a upgrade to the latest Horde/IMP/Kronolith/Turba and  
it's mostly working as expected, but the Free-Busy URLs which we have  
stored in the internal address book do not. Every time a user invites  
contacts by picking it out of the address book the error "Fehler beim  
Auslesen der Frei/Gebucht-Informationen für xxxx at kwsoft.de: Keine  
Frei/Gebucht-URL für xxxxx at kwsoft.de gefunden". The URL in the  
addressbook is  
"https://webmail.kwsoft.de/horde/kronolith/fb.php?u=xxxx" which was  
working in Kronolith 2.x. As no Free-Busy URL, not even from newly  
created users is working i suspect something missing in kronolith, but  
without error in the logfiles i'm somewhat lost.

Thanks for any help

Andreas