No.... :O
Simply I loaded my forumhome in the browser...
With that index.php page displayed, I uploaded the db_mysql.php file ONLY to server via FTP, and after the successful transfer i pressed the 'page reload' button.
Very very strange: before 40 queries, after (and now, since then) 41 !!!

It's just a mistery, not a problem, of course....
I've no time at the moment to investigate into db flow, but that's my black-box experiment....

Thanks