Bug with currency changing for all users

<span style=”font-family:"Verdana",sans-serif”>I updated to the latest version of your plugin and encountered a problem. If one user changes the currency then that selected currency will show for every user. I just confirmed this with a buyer in the USA (completely different region and other IP address). She changed the currency to USD and then my shop page also showed USD. I then changed it to JPY and then her shop page was also showing JPY. Obviously this is not how it should work.</span>