by David Mudrák.
Getting a completely blank page is a typical symptom of an error that is not displayed. Please double check your web server's access_log (to make sure the access to this script is logged) and error_log. Please note, the mdeploy.php utility is a standalone script, intentionally not including anything from the Moodle itself. So even if you have debugging level raised in your Moodle configuration, this mdeploy.php will probably follow the native PHP setting defined in your php.ini (there may be other places though such as .htaccess that a=may affect this). You may wish to check http://php.net/manual/en/errorfunc.configuration.php#ini.display-errors and http://php.net/manual/en/errorfunc.configuration.php#ini.error-reporting