So I played around with things a bit. I am running the latest version of BIAB 2017.

I seem to be able to render the file using the little square box once (and not always)

each time there after, the render process hangs with the quadrant never going green.

If the quadrant will go green I can generally drag and drop the part to sonar.

I'm wondering why the rendering doesn't always work?

Has anyone seen this behavior before?

Thanks in advance.
Phil