I don't think you should have brackets around Rock.
Thanks Jim. I was using the "[Genre]=[Rock]" that the Wizard in the top right Search created. By entering "[Genre]=Rock", it did create a playlist of the Rock Genre plus other Genres with the word Rock in it.
I think I found the problem though. I failed to mention that I am on a client connected to a Library Server. There are zero audio files on this client. When I enter "Rock" while the Library Server is loaded, I get:
When I was updating my Library Server with the latest 80 version, I tried "Rock" from the Library Server and it worked fine. Trying the example back on the client, I imported all the audio files from my NAS like the Library Server has and made sure the Main Library was loaded. I then entered "Rock" and got:
This is very similar to the results on the Library Server itself. Something changed at one point because my client which never had audio files did work fine like this last example.
I'm not sure what the right answer is, but there is definitely a difference with Play Doctor using a Library Server vs. Main Library.