There appear to be a bit of bug which occurs when zencart is set up with a shared SSL Certificate. To test the system it should be set up with SSL for the main site to allow a customer SSL login. - When someone selects a product from any area (which is not SSL) but being controlled by Ultimate SEO then the item does get sent to the basket. However if they try to log into the system turns to SSL. When the login button is pushed Ultimate SEO throws them to not found page.
This is a test i did

https://web131.secure-secure.co.uk/X...9rda2vc4u0obe1 - without Ultimate SEO - result OK

https://web131.secure-secure.co.uk/X...9rda2vc4u0obe1 - with Ultimate SEO FAILS


Standard links when logged on without SSL

http://XXXXXX.co.uk/shop2/index.php?...products_id=33 - without OK

http://XXXXXX.co.uk/shop2/logs-c-34/...logs-p-33.html - with OK

This only occurs in this occurrence -

The customer can click the back button and everything returns on this url
https://web131.secure-secure.co.uk/X...9rda2vc4u0obe1

I have checked out the .htaccess and everything is fine.
I have also checked this on another site with the same result

Any ideas how to overcome this problem???