Is something missing from a website that you know should be there. Perhaps you have recently updated your website or Google Classroom and the changes aren’t showing up for your students. Sometimes you can hit F5 a dozen times and it won’t update. That is just refreshing the page from the browser’s cache. Next time try Ctr-F5. have your students press Ctrl and F5 to skip the browser cache and refresh the page straight from the website server.