Works perfectly fine here, without any changes.

Hello,

I found a problem displaying the freebusy-information for required 
attendees. Allways the block "unknown" is displayed. In the part of 
"All attendees" the correct "sum" is displayed. So the problem is 
somewhere in

kronolith/lib/FBView.php -> function _getBlocks

             if ($member->getStart() > $start ||
                 $member->getEnd() < $end) {
                 $blocks .= $template->fetch(KRONOLITH_TEMPLATES . 
'/fbview/unknownblock.html');
                 continue;
             }


My hotfix looks like this so the freebusy-blocks are displayed correct...

             if ($member->getStart() == 0 || $member->getEnd() == 0) {
                 $blocks .= $template->fetch(KRONOLITH_TEMPLATES . 
'/fbview/unknownblock.html');
                 continue;
             }

We use horde in a kolab environment.

Greetings
Heiko Nöthen