Thanks Michael!

I'll do a rebuild.

I had noticed the occasional surface void in this project before this problem, but assumed it was a viewport error (those seem to occur in V2 on rare occasion). Since the object still listed as "solid" and not "joined surface" I assumed that it was intact. Is it possible that this is just an error in the way that MoI reports whether an object is solid or not?

Best Regards,
FDP