I have installed Kontakt 4 (was running Kontakt 5) on my Mac to use with VDL and Sibelius 7.  When I open up the mixer and try to ";create"; the sound sets by activating the Kontakt 4 VST file, it shuts Sibelius down every time.  Is there an update that I need, which I have not been able to find.  Do I need to uninstall Kontakt 5?  Thanks for any help you are able to provide.