Overseas postage edit button has stopped working

I wanted to pack a parcel to Australia and went to check what the postage rate was. I pressed the button, picked Australia from the drop down list, pressed 'calculate' and then nothing happened. The screen refreshed and I was still seeing the UK postage rate. I tried other countries and the same thing happened.

Please get this fixed pronto, it's going to be annoying for packing overseas parcels if you can't remember what postage has been put on the listing.

Just tried on another listing that doesn't have a bid on and it's working O.K., the eBid alert drop down box appeared so I could go to an overseas eBid site. Don't know if the bid was stopping the dropdown box from appearing as the item has finished now ?