Getting an empty /etc/userdomains file ?

Even though you have several domains, do you see an empty /etc/userdomains file ? This issue can pop up at times when your disk space gets filled up and the cPanel services malfunction. All you need to do is to update the cPanel domain- config files. This can be done by the script :

# /scripts/updateuserdomains

Now, you will be able to see the domains listed !