I'm sorry is this is a repeat question, but I don't really know the best search terms to look this up.
As far as I know this issue came about after updating to Wordpress 3.2
On this site: http://sideeffectsdesign.com/ the background behind the text in the slider is not showing in IE9. It displays fine in Firefox, Chrome etc. I am not sure about IE8 because I do not have it on my machine.
Can you suggest a fix?