Empty Halion window - no sounds?

Hope somebody can help though I must admit that I am on macOS High Sierra (see signature).

When I click on the little triangle in the Halion window to change the sound of an instrument the results are empty. (I did a fresh install of Dorico 1.1)
Halion empty.jpg

Try quitting Dorico, deleting the VSTAudioEngine folder in ~/Library/Preferences, then restarting Dorico to see if that helps.

Thanks Daniel, that helped!