Hi All, after spending countless hours trying to get my horde working after upgrade from 7.5.2 to 7.5.3 (linux fc2) I managed to get it working. Thought I might post what worked for me to save someone else a few hours, hopefully. =========================== Most probably there is the problem with the ioncube loader. To resolve this issue you should download ioncube archive from: http://www.ioncube.com/loaders.php unpack it and replace ioncube files with the files from archive. Usually ioncube files located in /usr/lib/php4/ directory. To specify ioncube files location you should run the following commands: # cat /etc/php.ini |grep -i ioncube # cat /etc/php.d/ioncube.ini |grep -i ioncube ======================= restarted the server after this, all was ok. I don' t know much else, hopefully it will help someone.