I haven't read all of this thread but you could, if you wanted to, put this little javascript snippet somewhere on the page (in a placeholder obviously):
Code:
<a href="javascript:location.reload(true)">Not displaying properly? Refresh this page</a>
You could either leave it there permanently or just until you resolve the problem. I do think, however, that this is most likely an ISP or proxy cache problem.
You could also set your own browser to not cache any pages:
http://www.wikihow.com/Clear-Your-Browser%27s-Cache
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