Tasks Pro™ uses object-oriented code that must be initialized before the PHP session is started, so session_autostart cannot be enabled.

You can disable session_autostart on only the Tasks Pro™ installation using a .htaccess file (Apache). Put the following in a .htaccess file:

php_flag session.auto_start 0

You can use the included 'example.htaccess' (renamed to '.htaccess') to do this.