Top Navigation Bar side-to-side movement during navigation

Hi there,
(1) Our top navigation bar does side-to-side movement when we click through ANY of the navigation bar titles in IE. It’s especially pronounced in IE 10. It happens on all pages in IE, and I did research the support items and found a recent reference in the forum for http://marsmarketing.com.au (I added that code to custom.css). We see that the Enfold theme works perfectly with IE10 at http://marsmarketing.com.au/
It seems like it’s only happens when we click on Products in Chrome. Our site is alvanatural.com.
(2) When we go from page-to-page the background flashes in our accent “salmon” color (the footer?) – can this be changed to something more neutral like light grey or white via custom.css without affecting other custom settings in Enfold Theme Options?
Could you let me know how these issues could be fixed? thanks.
*Great job – we like Enfold a lot. Well done.*