How to reproduce :
In the css file of a skin model add some border style parameters like this :

border-bottom-color: #f79c03 /* AMETYS ("default.header.border.border-color", "Liseret d'entête") */;
    border-bottom-width: 4px /* AMETYS ("default.header.border.border-width", "Liseret d'entête") */;

• then, in the cms-ribbon.xml file, test to display this parameters without menu, then display it in a menu like this :

  <group icon="" i18n:attr="" label="header" id="default.header">
                  <large />
                  <medium>
                      <layout cols="2" size="small">
                          <parameter id="default.header.border.border-color" />
                          <parameter id="default.header.border.border-width" />

                          <menu
                              icon-small="/plugins/skinfactory/resources/img/button/table_border_16.png"
                              icon-medium="/plugins/skinfactory/resources/img/button/table_border_32.png"
                              id="default.header.border" i18n:attr="" label="border2">
                              <parameter id="default.header.border.border-color" />
                              <parameter id="default.header.border.border-width" />
                          </menu>
                      </layout>
                  </medium>
                  <small />
              </group>

> without menu, the parameters are ok in the CMS ribbon, but when you display the parameters in a menu, you can not acces to the parametters, the menu is broken