I just got hold of a few 3rd party sample files called 'Space Age Voices', and 'Anthem Choir 2', they don't have libraries, but I use the file browser to copy the .nki files into the quick loader', and there I can load them, but as soon as the loading bar stops, kontakt immediately closes, other samples that I have loaded that do have libraries work perfectly, but not 3rd party files with the .nki extension, there wasn't even any error, and I'm not sure if kontakt uses the system error logs, or it has it's own.