Suddenly I can’t get the site to render properly

I have not added any plugin-ins, but suddenly if I create a new page or post, the site doesn't render properly. How do I fix this? Existing pages on the website show up fine on the front end. New posts or pages do not. What can I do to fix this? At the moment, I cannot update the site as a result of this. When I check for errors, it says I am missing a dependency for CatchResponsive-Html5 here: wp-content/themes/catch-responsive-pro/js/html5.min.js   And yet, when I look, that file is present. Any help will be appreciated. Thanks, Steve