by Alek Steva.
Thanks Ken.
Still, on test Moodle site, connected to the same AD, I have no problem with paged results. Only on production Moodle site, connected to the same AD, problem appears. That makes me think that it is not up to LDAP server and that there's some setting that I've been missing all along.
Tried to match php.ini, LDAP server and everything else on both sites.
Again thanks a lot for help.
Kind regards, Alex