Hi,
Got exactly the same problem only using IE8. Only with me the menu is cut off exactly at the navbar. http://www.svhumanistiek.nl
Help would be much appreciated 🙂
I found out that the culprit with me was a bit of added css.
.navbar-inner {
position: relative; top: 5px;}
Removing that fixed it.
I checked on IE7 again the other day and it was working, so I guess this is resolved!