I am having the same problems. The first items I added last week worked perfectly and the Autiva store was added to my listings and the items showed up in the store.
The items I added last night have not had the store added nor do they show in the listings that include the store. I really like this feature and would like my items to show the store and be listed in it.
Please help. It has been nearly 24 hours since I added the new items.