Hard Problem with shipping Virtuemart 2.0

[loop4633]

Hello everyone, I am writing again because it was pointed out a serious problem, and the worst thing is that I can not fix. So: When I buy an item without being logged on arrival at ceckout and the product appears correctly, but there is no shipping method currently in focus and if I click on edit shipping information appears select the preferred method of shipment but did not see anything. While if the same procedure I logged Having previously appeared regularly couriers configured. How can I fix? Can I make sure that if you click on add to cart being asked to authenticate?

I hope someone help me, I do not know where to turn and do not understand why you do not see the couriers if one is not authenticated.

Thanks in advance

[loop4633]

no one can help me?