Re: Can't get border radius to work on div inside Wordpress
It looks like you're running into the cross-domain limitation. PIE.htc can only be loaded from the exact same domain as the HTML file. In your case, your HTML page is at http://www.burk.es
but you're referencing PIE.htc from http://burk.es
-- those are treated as different domains so IE throws an Access Denied error.
If you change your CSS to drop the domain it should use the current domain and load properly:
It also looks like PIE.htc is being served with content-type of text/plain instead of the correct text/x-component -- see the Known Issues documentation page for how to fix that.
Also you might be interested in Gordon Brander's writeup on Wordpress theme integration if you're interested in making your theme portable: viewtopic.php?f=4&t=8