Out of date browsers can cause issues, make sure your browser is on the latest version. To update your browser simply restart your browser or computer, your browser automatically updates when it restarts.
Update your browser
Here are more details on how to update Chrome, Firefox, and Safari.
If you are using a Chromebook, check out this article.
Operating System out of date
Sometimes internet browsers stop supporting older versions of operating systems and you'll need to update your operating system.