I have a shop with different shipment rates (Netherlands & Belgium 0, other 100).
When the country does change the conditions are only changing when the state/county field also changes. I can force input there for some countries. But for example Belgium does not display any state. So changing from Germany (100) to Belgium still leaves the field with the value 100. Checkimg out I got an error. After reload the correct (0) amount is shown. I think that somewhere in the jquery the country change should also trigger an update. My knowledge of jquery is poor and could not find it.