I agree that it could be no problem with ispconfig, but in which way I have to look? PHP.INI is fine, I think httpd.conf also fine, ispconfig config.in.php also fine, /etc/sysconfig/apache2 also fine... Nothing extra configured - standart new server (also reinstalled X times all packages except Base system files), configured as it is described in Prefect install Suse, installed ispconfig ass needed, added 'Addhandler' in config.inc.php file. But what is strange - before this page runns on the same server with original Apache + PHP config but with manual vhosts.conf file configuration... What exactly are different before Old_server_configuration and Last_configurations - I'he no idea, I think that know is normal server configuration according many goog manuals etc... and now many extra packages are installed! The Error - it seams, that it can not find "X" functions in /wp-includes/functions.php file, but WHY?