Mike,
Nice. Congrats! I've tried Kontakt 6,7,8 with new VST3. Seem to work OK.

P.S. When you are scanning for VSTs for the first time, to avoid crashing, specify location of where you have your VSTs installed, otherwise it will try to scan whole computer for all DLL files...
Fortunately, VST3 seems very stable. There are still a handful of plugins it has issues with, but PGM should get these resolved.