So, I installed PHP 5.5.8 on Windows Server 2012R2 and base PHP works fine. ie: phpinfo();However, the setup kept failing with a bad path problem.Changing the line in bootstrap.php from:define('ROOT_DIR',str_replace('\\', '/', realpath(dirname(__FILE__))).'/');todefine('ROOT_DIR',str_replace('\\', '/', dirname(__FILE__)).'/');fixes the problem and sets the right include_path and ROOT_PATH.I did some testing. It seems that: print realpath(dirname(__FILE__));is an empty string. print dirname(__FILE__);is the correct pathname.Is this a PHP bug or a setting problem? or just a bug in osTicket. I doubt this, but maybe I'm reading it wrong.