Martin, your suggestions aren’t working for me. Preferences won’t rebuild unless I can launch Cubase 9. When I remove the contents of the preferences folder and reboot in safe mode, Cubase 9 balks because it doesn’t see valid licenses for Antares and Drum Core, which resulted from booting in safe mode. So that keeps me from opening Cubase 9. Then, when I reboot normally, I have the same original problem: Cubase 9 quits two seconds into initializing, and the preferences are never rebuilt. I’m still stuck with being unable to open Cubase 9. Am I missing something here? Any other suggestions?