Hi, new shipment adress add/edit does not work for a registered user. I fill the fields, press save. It goes back to checkout page, but I don`t see any change, no data has been saved.
Billing adress information edit also does not work very well - after save it gives errors about missing fields however I see that information is changed correctly.
As for true one page checkout I think you should integrate both billing and shipment add/edit also for registered users.
I`m using virtuemart 2.0.8c