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hmmmm very strange indeed..
i've checked your css files and your theme.html, and the sources when viewing the page, and as mentioned they are both identical.
which to me exclused it from being a stylesheet or theme error..
i'd be more inclined to go for a server permission problem..
in your mydownloads folder, chmod images folder to 777, also chmod all folders inside the images folder to 777 and also all the files aswell and try that..
u shudn't have to but i did notice on my site once, that some of the image folders had to be set 777 and the files themselves had to be 777 or IE didn't read them for sum reason or other. I think it's definitely an issue with the way IE reads them, and Microsoft really needs to take their head out of their asses and make IE fully css and w3c compliant..
other than what's already been suggested i can't think of anything else to try..