Yes, i have both keys plugged in. But I think, well I'm absolutely certain, the problem is that installing/activating cubase 4, the activation file for J8 on my Arturia key has been destroyed/damaged. When I interogate the Arturia key using the Syncrosoft licence control center there is no longer an entry named Jupiter 8V on the key. Instead this has been replaced by one entitled "Unknown Product". The entries for the Prophet V and timed demos are still fine.