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The new 5.4.3 update has fixed the issue for me - :thumbsup::):thumbsup:
I contacted support over a week ago but have yet to get a reply. I'm sure these things take a while though. I'd suggest that you submit a support...
In my case selecting the QC asio driver causes Kontakt to display a warning message and to write a crash dump. I am able to continue using Kontakt...
Thanks - glad to hear that things are progressing.
Have you heard anything back yet? I just submitted a report today, so hopefully it will get looked at soon.
Exactly the same problem here. On windows 8.1 I should add.