Cortex supports the current and last release of a the following browsers (Internet Explorer, Firefox, Google Chrome and Safari)
3 things must be done EVERY FIRST WEDNESDAY of the month, to avoid encountering unusual error messages.
1) Check the current version or your browser: Simply access this website https://www.whatsmybrowser.org/ , it will provide type and version of the browser you are using.
2) Update your browser if outdated: Here is a link (https://www.computerhope.com/issues/ch001388.htm) that provides all the information on how to update your browser if it is outdated.
3) Clear your browser's cache: Access this website, https://www.wikihow.com/Clear-Your-Browser%27s-Cache , then select your preferred browser and follow the instructions to clear your browser's cache. (Remember try to clear all time cache history)