Thanks for the replies,
Basically what happens is I update Kontakt, it runs fine in standalone mode. If I switch off automatic VST scan and put it into Manual in sonar the updated Kontakt also runs fine, have tried it in several projects.
However as soon as I put sonar into Automatic scan the next time I open a project it halts on the Kontakt DLL file. Then when I next go into Sonar Kontakt has been removed, it then halts on the next DLL of Kontakt until all the Kontakt plugins have gone from within sonar. But if sonar doesn't scan for them they run fine!
Can I tell Sonar to not scan for Kontakt at all?
Martin