I have an issue on DNN Default Menu :

<dnn:MENU ID="bootstrapNav" MenuStyle="bootstrapNav" runat="server"></dnn:MENU>

Which is included on DNN Default Skin on Ver 7.2

The Issue : If I have any child sub menu under the parent menu "which it take class dropdowbmenu" .. The Related Child Sub Menu not Appear

You can check that issue by creating any page under other page and allow both of them to appear in the menu and check that on IE8