I have an issue with WP Responsive theme and IE9.
It was working like a charm, but suddenly the menu appears at the very top of the website, you can see it here:
http://nomina123.net/ (the menu is appearing at the right of the logo in IE9), but in FF, Chrome and other browsers it works fine.
I am using a customized version of responsive WP theme.
I tried to undo everything I have done, including the removal of the submenus, changes I have done in styles and so on with no luck.
Also I tried to add the following:
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
to the header... no luck.
I was trying to "debug" the problem in IE9 using the F12 feature and disable one by one all the css styling for menu and menu-item related classes with no success, the menu persist at the top.
A desperate measure would be to restore the full site to the last stable version, but it is a multisite, so this is not an easy work to do, and probably too desperate for a single styling.