My shop is still in test mode and was a fresh install last week. When trying out the ordering system I get the following error after the shipping address is selected ():
Controller: Checkout, Action: PaymentMethod
Method not found: 'System.Nullable`1<System.Decimal> SmartStore.Services.Orders.IOrderTotalCalculationService.GetShoppingCartTotal(System.Collections.Generic.IList`1<SmartStore.Core.Domain.Orders.OrganizedShoppingCartItem>, Boolean, Boolean)'.
I have PayPal and Amazon payment plugins activated (although the account details have not been added yet).