XOOPS FAQ - Themes- Styles and Templates - I using the theme phpkaox, but after upgrading XOOPS Core, the menus displayed horizontally instead of vertically

The theme phpkaox is not part of Xoops core more. In earlier versions of Xoops core, there was some theme definitions in xoopsroot/ xoops.css They are removed, so you should include them in your themes CSS file The missing lines are


#mainmenu a {text-align:left; display: block; margin: 0; padding: 4px;}
#mainmenu a.menuTop {padding-left: 3px;}
#mainmenu a.menuMain {padding-left: 3px;}
#mainmenu a.menuSub {padding-left: 9px;}

#usermenu a {text-align:left; display: block; margin: 0; padding: 4px;}
#usermenu a.menuTop {}
#usermenu a.highlight {color: #0000ff; background-color: #fcc;}

The linebreak in the menu is created by