No, I failed to solve that problem. Something happened beyond my knowledge. Then I set up a new joomla installation on my second working domain, and it seems that there will be no problems. I set the menu item as SP Builder page wich shows joomla article category, and everything seems to be ok:
http://welcometobosniaandherzegovina.com/index.php/sppagekat/sp-page-cat-sub
No matter, I hadn't moved far from the beginning anyway on first aplication, I'm focusing on editing my articles on new aplication now. ;)
Thanks for trying to help.