The following steps will help you to successfully start Cubase (this worked for me).
Make sure that:
- You have installed the latest drivers (e.g. Steinberg Yamaha). Uninstall the old drivers first. After installing the latest drivers restart your computer.
- You have installed the latest version of your eLicenser Software. Uninstall the old one first.
- Run eLicenser as Administrator. Run a maintenance task.
- Run Cubase as Administrator.
Now everything is fine. You do not have to re-activate anything.