Fixed the missing Halion Sonic 3 errors in my case.
In Windows 10 :
- Close Cubase if it is open
- Press the start button and type %appdata% to go to the current user Appdata folder
- Open Roaming > Steinberg
- Select all the folders containing “Halion Sonic” CUT and PASTE them in another folder (NOT inside the same Steinberg folder) this way you will not lose the other preferences stored in the Steinberg folder (shortcuts, colors, recent files, all settings etc.)
- Restart Cubase
- Create an Instrument Track with Halion Sonic SE 3 and you should have all the 124 default preset back without errors