The keyword symbol on the photos in my library have suddenly disappeared. The keywords themselves can be seen in the "Keywording" section on the right side, but are now missing from the photos. This is another example of various things suddenly changing in Lightroom 5.
To get the keyword badge back on the library thumbnails, do View > View Grid Style > Show Badges.
Hi John, this worked! Thank you so much for your help. I have no idea of why the badges disappeared in the first place. It is just one more thing which changes in Lightroom and which is a mystery to me. Again, thank you very much for your help.