Update(26.01.2013): This problem has been fixed on WHMSonic v2.1.6. If you still have an autodj issue, read the below steps;
Solution:
Please follow the below steps to fix this problem;1.) Login to your WHMSonic root >> Make sure that the client playlist has some mp3 files under the playlist manager, click on reload the playlist button. Make sure that you have enabled the port range 5000:9999 on your server firewall configuration for tcp,udp both in and out.
2.) Click on "Fix Everything" link from your WHMSonic root at the bottom of your left menu. Run the fix everything system.
3.) Login to your root SSH and run this command to restart the WHM/cPanel system
service cpanel restart