Errors in Windows Surface Tablet IE11 on our mobile site

Hi,

I'm testing our mobile community site on tablets (currently available on smartphones only), and it works fine on all I've tried. The one exception is the Microsoft surface tablet running IE11.

On the Surface tablet the main menu isn't sliding open, none of the boards are listing on the category pages, and more. It seems like some major Javascript errors, except when I checked the F12-Developers tools there were no Javascript errors occurring that should cause that.

Has oneyone else experienced any issues with Lithium Mobile V1 + Microsoft Surface/mobile IE?

Thanks in advance!

Alan