[memobug]

I think it is the articlebot hack. I found that the errors might coincide with the cron, and there is this in articlebot.php

if (is_array($users))
        {
            foreach ($users as $userid => $user_posts)
            {
                /* +---------------------------------+
                   | Query: update article bot(s)    |
                   +---------------------------------+ */


                $DB_site->query("
                    UPDATE ".TABLE_PREFIX."user
                    SET posts = posts + $user_posts
                    WHERE userid = $userid
                ");
            }
        }

Thanks for the help. I will follow up in the articlebot thread.

Regards,

Matt