When a menubar is displayed at the right border of the browser window, the menu is shown outside of the window so that the user needs to scroll in order to see the menu.
This should be avoided by showing the menu on the left side of the menubar instead of the right side.

A patch to menu.js that works for us (not thoroughly tested):
 show: function(supermenu,submenu,submenuDiv) {
     supermenu=$(supermenu);
     submenu=$(submenu);
     submenuDiv=$(submenuDiv);
if (submenu) {
var menu = $(submenu);
//menu is already visible, don't do anything
            if (menu && menu.style.display=='') return;
            Ice.Menu.showMenuWithId(submenu);
            if (submenuDiv) {
                 // ICE-3196
                var left;
                                //check if menu is too far to the right
if (Ice.Menu.getPosition(supermenu,'Left')+supermenu.offsetWidth+submenu.offsetWidth>document.documentElement.scrollLeft+document.body.clientWidth){
left=-submenu.offsetWidth;
}else{
left=supermenu.offsetWidth;
}
                               //check if menu is too far on the botton
var top=0;
if (Ice.Menu.getPosition(supermenu,'Top')+submenu.offsetHeight>document.documentElement.scrollTop+document.body.clientHeight){
top=-submenu.offsetHeight+supermenu.offsetHeight;
}
                submenu.clonePosition(supermenu, {setWidth:false, setHeight:false, offsetTop:top, offsetLeft:left});
                submenu.clonePosition(submenuDiv, {setTop:false, setLeft:false, setWidth:false, setHeight:false});
            } else {
                 // ICE-3196
                submenu.clonePosition(supermenu, {setWidth:false, setHeight:false, offsetTop:supermenu.offsetHeight});
            }
            Ice.Menu.showIframe(submenu); // ICE-2066, ICE-2912
}
        Ice.Menu.currentMenu = submenu;
    },