Hi Nicolas,
Regarding add to cart:
I use two computers, one for testing and one for the back-end. I've been struggling for a while now with https access. It would let both computers access the https server and then, all of a sudden, I can't get access with one computer but I can with the other.
The reason I'm telling you all this is because it just kicked me off the https again on one computer a moment ago and when I tried the add to basket on the other computer, it worked fine.
I don't know if my router doesn't like more than one computer accessing the same secure server.
Have you ever come accross this scenario?
This is my first e-commerce site, so I'm new to everything, ie. https, ssl, shopping carts, etc.