Stopping and starting the service didn't work.
Restarting the computer didn't work.
Reinstalling the latest driver didn't work.
Crying didn't work.
Windows 7 and Cintiq 12WX.
OK.Stopped the service.
Opened the Windows Task Manager.
Showed processes from all users.
Closed anything with ‘Wacom’ in the name.
Started the service.
Tablet prompted me to calibrate when I restarted the service.