Hi Guido, I had the same probleme one year ago with Notion 6! I got this answere from Presonus, and it works. This was the message.... I was referring to a new user account on your Windows computer. Not a a new PreSonus user account. You would have to create a new user account in the Windows Control Panel, log out of your current account, reboot the machine, and log into the new one. If that works, you can move everything over to the new user account. Documents, settings, etc.
DAW and Notation Tech Support Manager
Greatings Harry Mingels