TROUBLESHOOT
          
        
VOCALOID4 Editor for Cubase
Deactivate the software and then activate it. 
If the deactivation fails, contact Yamaha's VOCALOID Products Customer Center. 
Activation and Deactivation - VOCALOID products registration
If you are unable to find a solution in the Troubleshooting section, please use the Inquiry Form to submit an inquiry.