Just today a user notified me that the website and all pages show an Error 404 - Not Found, except for the home page which does not show any posts. The media library is also empty. I am not a web designer, just a user who took over admin duties, and I know nothing about WordPress. I don't have access to our host server. Here is our site: http://www.chicocameraclub.org/blog/ . Any advice would be most welcome.