I can't reproduce this.

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Hello,

Can someone help me with this question/problem?

Thank you.

I've one similar situation but my hook give me more information, give 
me the search_sources and the default fb_cals.

My hook have this configuration:

<?php
class Kronolith_Hooks
{

     public function prefs_init($pref, $value, $username, $scope_ob)
     {

         if (is_null($username)) {    // not logged in
             return $value;
         }

         switch ($pref) {
                 case 'search_sources':
                              $sources = $GLOBALS['registry']->call('contacts/sources');
                         $value = json_encode(array_keys($sources));
                             $scope_ob->set($pref, $value);
                        $scope_ob->setDirty($pref, true);

           case 'fb_cals':
               $fb_cals = @unserialize($GLOBALS['prefs']->getValue('fb_cals'));
               if (empty($fb_cals)) {
                 $display_calendars = 
@unserialize($GLOBALS['prefs']->getValue('display_cals'));
                 $fb_url = 'a:1:{i:0;s:32:"internal_' . 
$display_calendars[0] . '";}';
                 $GLOBALS['prefs']->setValue('fb_cals', $fb_url);
                 $scope_ob->set($pref, $cenas);
                 $scope_ob->setDirty($pref, true);
               }
           return $value;
         }
     }
}

With the search_sources configured  to automatically prepare   
Kronolith's search_sources my freebusy stopped to show about 
availability of an attendee.

Hello,

I've been trying to configure my instance to automatically prepare 
Kronolith's search_sources with all address books the user has access 
to, for that I've enabled  the hook in the local prefs.php 
kronolith/config/prefs.php and configured the hook in 
kronolith/config/hooks.php:

<?PHP
class Kronolith_Hooks
{
     public function prefs_init($pref, $value, $username, $scope_ob)
     {
         if (is_null($username)) {    // not logged in
             return $value;
         }

         switch ($pref) {
         case 'search_sources':    // enable all sources by default
             if ($value == '') {
                 $sources = $GLOBALS['registry']->call('contacts/sources');
                 $value = json_encode(array_keys($sources));
                 $scope_ob->set($pref, $value);
                 $scope_ob->setDirty($pref, true);
             }
             return $value;
         }
     }
}

So when I've tried to login, my search_sources are populated but my 
freebusy doens't work anymore. Before this configuration I had my 
search_source configured manually to look only for my localldap 
configuration and that way my freebusy work fine.

Any idea of what are happening?

Thank you.