omg, i cant believe this, i did some hacks, and got it working.
here is what i did
went to /usr/local/sitebuilder/htdocs
created a file called info.php which contains
<?php phpinfo(); ?>
it seems, the ini file was parsing the files for old SB instalation, php51, on /opt
so, moved php51 to php51.back, and created a symlink ln -s php51 php52
and w00t, works now perfectly fine.