add the order by clause to the CSSMenuWriter/CSSMW_home/menu.php page.
change line 65:
$query_menuwriter_categories1 = sprintf("SELECT CategoryName, CategoryID, CategoryParent FROM ps3_categories WHERE CategoryParent=%s", GetSQLValueString($catID, "int"));
to:
$query_menuwriter_categories1 = sprintf("SELECT CategoryName, CategoryID, CategoryParent FROM ps3_categories WHERE CategoryParent=%s ORDER BY CategoryName DESC", GetSQLValueString($catID, "int"));
and change line 91:
$query_menuwriter_categories = "SELECT CategoryName, CategoryID FROM ps3_categories WHERE CategoryParent = 0";
to:
$query_menuwriter_categories = "SELECT CategoryName, CategoryID FROM ps3_categories WHERE CategoryParent = 0 ORDER BY CategoryName DESC";