Check your browser:
Please check that your browser is up-to-date. We recommend using Google Chrome, Mozilla Firefox, and Safari.
Once confirming you are using the latest version of your browser, refresh your browser window. On many browsers, you can press the F5 key or Command+R keys on your keyboard.
Finally, close all other tabs and windows in your browser.
If web pages aren’t displaying correctly, you can try using your browser’s incognito or “private browsing” mode to see if the problem is caused by something other than cache or cookies.
Clear cache and cookies:
Cookies, which are files created by websites you’ve visited, and your browser’s cache, which helps pages load faster, make it easier for you to browse the web. Clearing your browser’s cache and cookies means that website settings (like usernames and passwords) will be deleted and some sites might appear to be a little slower because all of the images have to be loaded again.
How to clear cache and cookies for each browser: