Hi,
That sounds like a redirect from an "old" dynamic URI to a new static one.. breaking any "post" between one page and the next.
That could be caused by you nhot having modified the includes/functions/html_output.php with the code from URI Mapping or by you using hard-coded URIs in your template for your product index pages.. in which case you should edit the links to use any new URIs or to use the standard zen_href_link function.
Hope that helps you get this sorted.
All the best...
Conor
ceon
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