What is a "browser cache"?
Your internet browser's cache stores snapshots and images used by webpages you visit on your computer or mobile device so that they'll load more quickly upon future visits. Occasionally your cache can prevent you from seeing updated content, or cause functional problems when stored content conflicts with live content. You can fix many browser problems simply by clearing your cache.
How to clear your browser's cache
Before you start, please make sure you are using the latest version of whatever browser you use.
The article linked below is an excellent site for clearing your cache. It has browser-specific pages that contain excellent instructions with screenshots on how to clear the cache for whatever browser you might be using.
When clearing your cookies and cache, please make sure that you only select cookies and cache, do no select "Form fill data" or "Passwords", as it will delete those as well.
Finally, if you're using Safari, be aware that it clears everything (cookies, usernames, passwords, cache, etc) when you choose this option.