Hi saguaros,
you are right - now it is working correctly and the reason was exactly what you are writing :-)
And could you, please, advice me how can I achieve to have horizontal menu when I click in the main menu (on the left) "KDO JSME". I added the "Kdo jsme menu" modul, but I see both menus - Porfolio 1 Menu and Kdo jsme mixed together. And when I click on some menu item from "Kdo jsme menu" I see articles white... It means that it looks like there is nothing. But it is not true.
In the documentation I could not find more hints for this.
Thank you very much for your help.
Karin