[Plugin: navigation] Nav menu in child of Twenty Eleven theme doesn't show in IE9

Hi folks,

I have a child theme of the Twenty Eleven where I’ve moved the access bar to the top of the page and taken out backgrounds/colours.

All looks fine in browsers other than IE. IE9 does not show it at all, and IE8 compatibility view shows it in the original position, all black.

Here’s my url:

Thanks for any help!

https://www.ads-software.com/extend/plugins/navigation/