Thanks for the plug, scook. Now I HAVE to get the OP issues fixed. :)
I completely agree with scook's advice - which would be to try to find a way to get X3 past these VST scan issues, and his approach is a good one - please for the moment, move the Kontakt 5 dll's to a different folder that is not going to end up getting referenced by the Sonar X3 VST scan, and then try to launch Sonar X3 and I would again at that point try doing an explicit Rest, followed by a full Scan.
It would be good to get you to where X3 can run, even if Kontakt 5 is temporarily not present, and then we can try to work out what sorts of things are going on with your system that would prevent Kontakt 5 from being scanned.
I DO have a question: you indicated that you did launch Kontakt 5 in stand-alone mode, and that it worked. Is it possible you paunched a 32-bit version of it, rather than the 64-bit version of it (Kontakt 5)?
I am just grasping here - wondering if perhaps the 64-bit version needs to also be run in stand-alone mode, to complete its authorization process.
Might be worth a shot - double-check the properties of the Kontakt 5 and make sure it is running 64-bit in stand alone.
Bob Bone