[Konrad]

Hi, thanks for reply. Unfortunately, this import does nothing. Menu is still invisible… Below is copy/paste from style.css:

/*
 Theme Name:   Interface Pro for Arbena
 Theme URI:    http://arbena.pl
 Description:  Interface Pro for Arbena customization
 Author:       Konrad Tabor
 Author URI:   
 Template:     interface-pro
 Version:      1.0.0
 Tags:         
 Text Domain:  interface-pro-child
*/

@import url("../interface/style.css");

/* =Theme customization starts here
-------------------------------------------------------------- */
[rest of custom style css]

Site is still running 1.0.3 version.