Thanks David. Will note the issues you highlighted. From your own experience, it would seem confirmed that there are issues with VS 2022 on Java for 9.4.0.
I do actually use two machines. The one runs Windows 10 on a VM. It does not support OpenGL, so it is stuck on vtk 6.3.0. The other is a Sun workstation on which I’m running 8.2.0 on 32 bit / Java 8.
All along I meant to transition to Java 23 / 64 bit. I do now have not the option of 9.4.0 on Java 8.
I will try ninja again once Vs is reinstalled. Thanks very much. I will be reporting back soon. Thanks again.
ngwarai