Older versions or other browsers may give inconsistent results. Other major browsers, such as Apple Safari, Mozilla Firefox and Microsoft Internet Explorer should generally be ok, however please make sure you are using a current version. It is a free download, easy to install, and available for all platforms.
If you are accessing this course on the desktop or a laptop, Google Chrome (currently the most popular browser in the world) is the recommended browser for this site, and switching to it will likely solve any issues you may be experiencing.
