brand new K2 malfunction in Explorer

Hi, I’ve spent a whole day trying to get the sidebars to show in Explorer. I run WP 2.1.2 and the second latest K2 (March 18).
I don’t get the sidebars to show properly in IE. Firstly it takes ages to load the index page. And then only one sidebar showes (I use the brand new 2-sidebar option) but it shows way down on the page, after the last article.

The sidebars do appear if you click on any article.

Check here

I’ve tried a number of things:
-Disabling all plugins one by one
-Fiddling with the following pieces of code in style.css:

sidebar-dual #page {
	width: 950px;

and

.sidebar-dual #primary {
	margin-left: 170px;
	padding: 10px;
	}
#sidebar-main {
	float: left;
	width: 200px;
	padding: 10px;
	}

So I need your support!