It might also be instructive for you to find the file application.log in %APPDATA%\Steinberg\Dorico 2 (Windows) or /Users/your-username/Library/Application Support/Steinberg/Dorico 2 (Mac) and attach that here, and perhaps also to zip up the VSTAudioEngine2_64 folder from %APPDATA%\Steinberg\ (Windows) or the VSTAudioEngine2 folder from /Users/your-username/Library/Preferences/ (Mac) and attach that here too.