Problem with threadbit_background variable

[Lynne]

I'd suggest looking at the difference in the CSS for the IE browser versus the firefox browser. Or, if there is no difference, the just looking at the CSS. What class is it that applies the background?

Taking a quick look at the threadlist-ie.css template, I'm guessing this may have something to do with it and you may want to modify it:

.threadbit .nonsticky, .threadbit .discussionrow {
    background: {vb:stylevar threadbit_background.backgroundColor};
    _background-image: none;
    position: static;
}