Got it.
In the template navbar_bottom
FIND
Code:
<td id="navbar_search" class="vbmenu_control"><a href="search.php$session[sessionurl_q]" accesskey="4" rel="nofollow">$vbphrase[search]</a> <script type="text/javascript"> vbmenu_register("navbar_search"); </script></td>
REPLACE WITH
Code:
<td id="navbar_search2" class="vbmenu_control"><a href="search.php$session[sessionurl_q]" accesskey="4" rel="nofollow">$vbphrase[search]</a> <script type="text/javascript"> vbmenu_register("navbar_search2"); </script></td>
FIND
Code:
<td id="usercptools" class="vbmenu_control"><a href="$show[nojs_link]#usercptools">$vbphrase[quick_links]</a> <script type="text/javascript"> vbmenu_register("usercptools"); </script></td>
REPLACE WITH
Code:
<td id="usercptools2" class="vbmenu_control"><a href="$show[nojs_link]#usercptools2">$vbphrase[quick_links]</a> <script type="text/javascript"> vbmenu_register("usercptools2"); </script></td>
FIND
Code:
<if condition="$show['searchbuttons']">
<!-- header quick search form -->
<div class="vbmenu_popup" id="navbar_search_menu" style="display:none">
REPLACE WITH
Code:
<if condition="$show['searchbuttons']">
<!-- header quick search form -->
<div class="vbmenu_popup" id="navbar_search2_menu" style="display:none">
FIND
Code:
<if condition="$show['member']">
<!-- user cp tools menu -->
<div class="vbmenu_popup" id="usercptools_menu" style="display:none">
REPLACE WITH
Code:
<if condition="$show['member']">
<!-- user cp tools menu -->
<div class="vbmenu_popup" id="usercptools2_menu" style="display:none">
I've just been testing it and it works fine on IE on my site.
A word of advice, if you want to add any other dropdown menus to the bottom navbar, make sure they have a different ID to those in the main navbar otherwise this duplication will occur again.
I'll update the plugin and get it re-released later (probably tomorrow).