Asset Store: Can't enter country in "Address Information Required" dialog

When trying to purchase something in the asset store the “Address Information Required” dialog appears. In the country field when you click on it, it just displays “Loading…” and nothing else ever appears. If you click on “Loading…” then it fills it in as the country. You can’t manual edit the field. I’ve tried it in IE and Chrome. If you then hit the save button it does nothing and the cancel button just closes the dialog and a second later it reappears.

I’m having this same issue as well.

I’m in the UK.