Thanks for all your feedback, Possum, Kuroi, and of course Moderator

I had a look at the buy now -> shopping cart vs buy now -> product info issue.
It does not have any thing to do with the Edit Cart mod. If you add a product with no attributes to your catalog, then hit the buy now button, I am pretty sure it will take you to the cart.

When a product has attributes, even clicking a buy now button, you get taken to the product info page. It seems to be by design, even when the product is not priced by attributes.

I had a little look at what it might be, but couldn't see it. I can only tell you where I would start to look. You should look at includes/main_cart_actions.php to find the name of the action that your buy now button is calling, and you should see there the corresponding function of the classes/shopping_cart.php that is being called. Then if you step through the logic in that class, my guess is that it will have some kind of check if the attributes have been set or not.

But it could be that if the product has attributes, it needs to have values for each attribute passed in when adding to cart. Because subsequent logic matches DB/product/attributes with Cart/Products/attribute_values.

Hopefully somebody more knowledgable will spot this post

Justin