For anyone who wants to add another drop down nav menu, you'll need to add the nav menu id to the css.
Code:
/* Fix navbar pop-up menus */
#usercptools_menu, #navbar_search_menu, #navbarid_menu{
margin-top: -210px;
margin-left: -25px;
}
Replace navbarid with the id you selected here
Code:
<td id="menuid" class="vbmenu_control"><a href="$show[nojs_link]#menuid">label</a> <script type="text/javascript"> vbmenu_register("menuid"); </script></td>
Hope this might help somebody.
Also, I'm using this on 3.6.5 with no problems.\
:edit:
Just upgraded to 3.6.8 and everything with this style is still working.