The first step to troubleshooting any site or course issues is to make sure your browser is fully updated. Please see the attached PDF with steps to ensure your browser is up to date.
Our official supported browsers are Chrome, Edge, and Internet Explorer.
If you are unsure of which browser you are using, and if you are up to date, please click this link: What browser am I using? Is my browser up to date? - WhatIsMyBrowser.com