I experienced a problem with Kronolith after upgrading to 7.4: Every 5 minutes I would get the message
Nov 30 00:10:04 myserver HORDE[5151]: [kronolith] Permission Denied [pid 5151 on line 229 of "/home/httpd/html/horde/lib/Horde/Alarm.php"]
in /var/log/messages
I seem to have solved this problem by adding admin as Horde administrator:
/sbin/e-smith/config setprop horde Administration enabled
/sbin/e-smith/signal-event email-update
This bug hit me too. Raised a bug. Track here
http://bugs.contribs.org/show_bug.cgi?id=4827thomas