No Stock vs. Limit Reached

The product listed below is working as expected. When you click on Medium size, it shows the text "No Stock" below.

www.allthingssassyboutique.com/index.php...quoise-sweater-tunic

The product listed below is set up the same as far as I can tell, but when you click on small size - the text indicating there is no stock does not appear. Instead, if a customer clicks to add this product to the cart, it takes them back to the category page and says

Limit reached. You can't add the product:
The cart is empty

www.allthingssassyboutique.com/index.php...tem/product/cid-1971

Do you know why they might be causing #2 to not act the same as #1?

Please advise...

Thanks in advance.

Are you sure that the #2 stock is set to 0 ?
Is the medium variant published ?

Yes - quantity is set to 0.
I believe medium variant is published - as would we see it from the front end...

Can you give us screenshots of your #2 parameters and of its variants ?

Here are the screen shots your requested...

How do you have set the menu or module to arrive to this link:
www.allthingssassyboutique.com/index.php...tem/product/cid-1971 ?

The menu link to tops is a category listing.
The menu link to sale items is a product listing. This is the problem one.

So - that is a difference, but I don't understand why that would make a difference.

Do we need to make them all category listings?

Thanks for you help in advance.

Have you tried to update to the latest version from our website as Nicolas said ?

Because you shouldn't have a link like ".../cid-1971" but it should be like ".../1971-Black-Belted-Tunic".

Can you confirm that by upgrading from 1.6 to 2.0 (all on a joomla 2.5 site) - will it strip out existing information or items?

You will not loose any data. If you have edited views in HikaShop > Display > Views and not directly via FTP in the Hikashop folder, so it's ok.

Don't forget to make a backup before, we never know.