Agreed but it seems something has to be different... I just ran the same three browsers against the home page on browsershots and they are all showing up fine. I wonder what it is about the page that would pre-empt the background for those browsers on that page.
I'm assuming that there's nothing in the notes on the right in the post above for IE9/10 that might explain the issue.
Could it be something in the different style sheets that are loaded in each page that may create an issue in IE8/9 on some machines?
Home Styles:
<link rel="stylesheet" href="/plugins/system/mediabox_ck/mediabox_ck/mediaboxAdvBlack21.css" type="text/css" />
<link rel="stylesheet" href="/media/jui/css/chosen.css" type="text/css" />
<link rel="stylesheet" href="/media/com_hikashop/css/frontend_default.css?v=213" type="text/css" />
<link rel="stylesheet" href="/components/com_jevents/views/alternative/assets/css/modstyle.css" type="text/css" />
<link rel="stylesheet" href="/media/com_finder/css/finder.css" type="text/css" />
Image Page Styles:
<link rel="stylesheet" href="/plugins/content/sigplus/css/sigplus.min.css" type="text/css" />
<link rel="stylesheet" href="/plugins/content/sigplus/engines/boxplus/popup/css/boxplus.min.css" type="text/css" />
<link rel="stylesheet" href="/plugins/content/sigplus/engines/boxplus/popup/css/boxplus.lightsquare.css" type="text/css" title="boxplus-lightsquare" />
<link rel="stylesheet" href="/plugins/system/mediabox_ck/mediabox_ck/mediaboxAdvBlack21.css" type="text/css" />
<link rel="stylesheet" href="/media/jui/css/chosen.css" type="text/css" />
<link rel="stylesheet" href="/media/com_hikashop/css/frontend_default.css?v=213" type="text/css" />
<link rel="stylesheet" href="/components/com_jevents/views/alternative/assets/css/modstyle.css" type="text/css" />
<link rel="stylesheet" href="/media/system/css/modal.css" type="text/css" />
<link rel="stylesheet" href="/modules/mod_slideshowck/themes/default/css/camera.css" type="text/css" />
<link rel="stylesheet" href="http://fonts.googleapis.com/css?family=Droid+Sans" type="text/css" />
<link rel="stylesheet" href="/media/com_finder/css/finder.css" type="text/css" />