Products With Attributes Crash In Shopping Cart - URL rewrites

I am trying to build a product which is modular rather like a pc.

The costs per attribute are fine, and when the item is placed in the shopping cart the totals are fine also.

All attributes and option names have more than one option.

http://www.iss-store.co.uk/catalog/merck-hitachi-chromaster-analytical-hplc-system-configurator-p-9242.html

However once the item is in the cart, and you goto click on the item, to perhaps review it once more, i get an error message?

"http://www.iss-store.co.uk/catalog/product_info"

Not Found

The requested URL /catalog/product_info was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

Something about your URL re-writer, I'd guess. If I click on the link you provided, it resolves to http://www.iss-store.co.uk/catalog/index.php?main_page=product_info&products_id=9242, with: 'Sorry, the product was not found.'

For over 7 years now, we have followed a very strict rule when building zencart sites...

Rule: Never use any "SEO URL" module.

They cause more problems than they solve - and that's quite a few when you realise that they don't solve any problems in the first place.

Sorry i was trying something i think it maybe the URL SEO

http://www.iss-store.co.uk/catalog/merck-hitachi-chromaster-analytical-hplc-system-configurator-p-13235.html

Once you have a product in the cart, the link to the product have this addition to the URL:

...products_id=13235:adf72255816da3f4814e11f194984199

which isn't a valid page id. I have no idea what that is.

stevesh, that's the attribute hash. It only appears if the product has attributes selected for it.
That in itself is not the problem.

The problem is the URL rewriting they're doing, wrongly.

Moving this out of the Bug Reports section, because it's not a bug with Zen Cart core code.*