ok, running it as root gave me the above error, plus:
PHP Warning: Call-time pass-by-reference has been deprecated - argument passed by value; If you would like to pass it by reference, modify the declaration of create_form_check(). If you would like to enable call-time pass-by-reference to true in your INI file. However, future versions may not support this any longer. in /var/www/vhosts/site//httpdocs/forum/ubbt.inc.php on line 1912
So maybe it is a bug in threads?
