Our developer installed the simple seo urls on our zen cart www.clicknorder.co.uk but it doesn't seem to be working correctly,
Originally at first look the urls seem to be rewritten properly on the categories and products, but then when I click on a banner advert that has the old url it does not redirect to the new url, then when you click on the category via the nav bar it gives an error and brings up the old url of the category and says error not redirecting properly.
We have tried clearing the caches and emptied the links_aliases table again and turned Simple SEO back on but still seem to get errors.
Any help would be greatly appreciated

Regards