Kontakt instrument crashes - but only on Windows

Hi guys,

I'm finishing up a Kontakt instrument and all works perfectly on Mac. However, when using a Windows machine, certain instrument functionality causes Kontakt to hard crash, with no crash logs generated.

I have six sample sources that can all be mixed together. When selecting a few specific samples, before either switching samples using GUI arrows, or going into Kontakt's edit menu, the instrument freezes up and crashes.

Has anyone seen this behaviour before/know what's going on?

Thanks!