No NI. I’m using Yamaha S90es as my main keyboard. Also iRig Keys and Akai MPD drum pads. All produce the same Cubase crash if turned on or off while Cubase is running. HALion doesn’t crash here.
Went back and tried trashing preferences again. This time it worked. (Maybe I forgot to remove all previous Cubase version prefs when I trashed them before.) Happy now.