in the CSSMenuWriter/cssmw_main/menu.css file, change:
ul#cssmw_main {
cursor: default;
list-style-type: none;
margin: 0 0 0 0;
padding: 0 0 0 0;
}
to:
ul#cssmw_main {
cursor: default;
list-style-type: none;
margin: 0 0 0 0;
padding: 0 0 0 0;
position: relative;
z-index: 999;
}