Keyscape tone glitches with 2 instances and Multi-processing active

Looking for other users with Keyscape possibly having problems running more than one instance.

If I run two instances with “Activate Multi Processing” set to on I have tones dropping out with both instruments armed and also at playback.
If I turn off multi-processing problem goes away, - but dont prefer that setting.
Hyperthreading turned off does not help
Asio Guard disabled does not help
I’m in contact with Spectrasonics but they cannot recreate it and hence not much to do.
Keyscape is version 1.1.0f 64bit
Keyscape sound source is v1.0.2
Keyscape patches is at v1.2c

Help is much appreciated

I just upgraded to CU10 and still have the same problem.