We have a multistore setup with one domain www.fraeser-shop.de. Using https and ultimo theme and some small extensions. You can change the store to another domain and before ultimo and https the cart was shared and users could add products in both stores and checkout in one of them. SSID is added to the link when changing stores.
Now the users gets logged off if logged in or the cart is empty as well if not logged in.
Anybody an idea? I tried very much but it is just not working.