Hi
I have a test to use the code that you provider, but it works fine, did not display the probelm as you described, it is suggested that you should use a new menu control have a test to use the same datasource. below is my html code of the menu control,
<asp:Menu ID="Menu1" runat="server" DataSourceID="SiteMapDataSource1" Font-Bold="True" Orientation="Horizontal">
</asp:Menu>
<asp:SiteMapDataSource ID="SiteMapDataSource1" runat="server" ShowStartingNode="False" />
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Yours sincerely,
Amanda Wang
Microsoft Online Community Support