So far Kontakt 5.6 VST and VEP 6 are not working together at all. AU seems ok
Initially i launched Kontakt and loaded Spitfire Albion One. The graphics in Albion One were all messed up. I contacted spitfire and they had me delete some Kontakt Scripts. They blamed it on VEP6.
Next. I opened VEP6 and tried to load Kontakt. I get a, "Your Kontakt is too old" WHAT? no problem, i uninstalled Kontakt and all the plugins from all the folder using these instructions.
https://support.native-instruments.com/hc/en-us/articles/210291865
Reloaded Kontakt and updated it
I made sure Kontakts plugins were all the same in all folders and loaded as 5.6.
opened VEP6. clicked on Kontakt and VEP crashes instantly.. this is repeatable over and over.
I unistalled VEP 6 completely and loaded VEP 5.4.13741 Kontakt works perfectly..
OSX 10.11.6
Mac Pro