I changed my setting to show prices in bitcoin and replicated your problem.I see where the problem lies.When you are set to view in bitcoins, adding postage apparently converts it to dollars, and stores that number, fucking things up - you enter 1, it comes back with 3.03 when the page reloads.For a temporary fix until admin has a chance to look at it, just change your setting to dollars, and enter a dollar amount for the charge, and it will properly save the amount. When your done you can change back to bitcoin display, it won't affect the postage settings once they are saved. It works fine for me, but I display in dollars on my account.Postage is still displayed in bitcoins at checkout, as is the item itself, regardless of the customers display settings.