[Zope] some zope page content missing

I have seen and heard of some people coming to my site and not seeing pages or seeing only partial pages. Is there a known IE bug out there that would cause this or is this possibly a known zope issue. most of my pages are straight html in dtml document and dtml methods and I am running Zope 2.6.1. This page apparently is not showing for some people: http://www.horse101.com/Classifieds/sale_horses/adverts/915 Also, there is a graphic above all of my ads on the right hand column of this page above the google ads and I have seen on someone's IE6 browser that not all things show up. There are 4 graphics in this right column if you cannot see them all.