ck,
it does not look like you are using ultimate URLs, and by disabling them, it looks like nothing has changed on your site.
that said, i think i have found your problem. your links are creating something like:
http://www.veroboard.com/Product_inf...perfboard-3-x4
when the P in Product_info should be lower case. so that this link works fine:
http://www.veroboard.com/product_inf...perfboard-3-x4
there is still some sort of URL rewriting going on; but if you can get the link creator to make that lower case p; or the link interpreter to correctly parse Product_info (as well as product_info), i think you would be fine...
there should be another configuration setting somewhere for this URL rewriter that is still at work. i know Ultimate URLS, and i have not seen those at work on your site at all...
good luck!
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