Howzit peoples. Project of mine is to upgrade our Helpdesk from v3 to v4. My Current setup Redhat 6 [root@localhost zend]# uname -a Linux localhost.localdomain 2.6.32-71.el6.x86_64 #1 SMP Wed Sep 1 01:33:01 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux PHP 5.3.x and ZendOptimser/Guard 3.3 [root@localhost zend]# php -v PHP 5.3.2 (cli) (built: Aug 17 2010 04:35:29) Copyright (c) 1997-2010 The PHP Group Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies with Zend Guard Loader v3.3, Copyright (c) 1998-2010, by Zend Technologies I've uploaded the files in binary and as an added extra I uploaded the .tar.gz and extracted all via SSH but nothing seems to help. This is the error message. Fatal error: Incompatible file format: The encoded file has format major ID 3, whereas the Loader expects 4 in /var/www/html/support/__swift/swift.php on line 0 All issues like this point to files being uploaded in ASCII etc however I've made sure that the files have been binary or uploaded the tar.gz and extracted it on the server. Anyone got any other ideas I can try? Thanking you.