The only change I have made is to remove the virtuemart cart image in /components/com_virtuemart/themes/default/templates/common/minicart.tpl.php
I have trawled the Virtuemart forum with no luck yet.
Looking at the URLS is the only clue I have to go on. Here is your code for a download (downloadids removed):
href="
www.joomace.net /index.php?option=com_virtuemart&page=shop.downloads&func=downloadRequest&download_id=XXXXXX"
linkindex="59">
and on my site:
href="/shop/download-area/downloadrequest&download_id=XXXXXX" linkindex="23">
So it looks like my URL is more search engine friendly than yours. Have you any custom configurations for the order page? Can you think of why your URL has less SEF processing than mine?
thanks for your help so far. I hope we can fix this soon..