It seems like there are a lot of posts lately from individuals having isolated problems/glitches with the site. I wonder if there is a correlation between the computer system's operating systems, software, security, browsers, plug-ins, updates, etc and site cookies. Issues with essential cookies can cause certain features not to work. I often see the first responses suggest to clear the cache. Recently, that sometimes works and sometimes does not.
Here is an excerpt from FAA's Cookie Policy:
A. Essential Cookies - Essential Cookies are necessary for the Websites to function and cannot be disabled. These cookies are essential for enabling user movement around the Websites and providing access to features of the Websites. These cookies do not gather information about you that could be used for marketing purposes, do not remember where you have been on the internet, and do not store any personally identifiable information. If you set your browser to block or alert you about these cookies, some parts of the Websites will not work.