the site is working great, but for some reason the div: main_nav, and the php for the menu block is not showing in these particular versions of IE.
works in Chrome, Safari and Firefox and IE10

thanks so much for ANY clue as to what I should look at. Brain storming is OK.

I'm on a Mac so I'm doing SauceLabs to see the IE problems, the developer tools are mushy to work with and but it confirmed that the div : main_nav is not there, even though it's in the header.php file and the css files.

Magically there for ie10.