As you may have noticed, servers no longer are listed in the "Join Game" menu. This is because the official master server that all servers point to is down, perhaps for good.
What does this mean? Well, you won't be able to see the servers that use that master server anymore. You can still connect if you know the IP address through the console.
JKHub has it's own master server that many servers are pointing to, and may soon have all of them pointing to it. The only way you can change your master server though, is to:
[font=verdana]OpenJK[/font][font=verdana] (lots more benefits, bug fixes, etc)[/font]
[font=verdana]Use the [/font][font=verdana]All Seeing Eye mod [/font][font=verdana](Windows only)[/font]
[font=verdana]Use JKJALaunch (Mac only)[/font]
You can also manually view the JKHub master server list in your browser here.
This post will be updated if anything changes, but I definitely recommend using OpenJK despite this one benefit. It's the ongoing project to fix JKA, the big patch we've been wanting since day one. DE's server is running OpenJK too.