I've been working on this star cluster for a while. Because there's now so many objects, I decided to put it in a spreadsheet to automatically rebalance orbits and such, and then I could just copy to the .sc file.
However, when I looked at the finished product, something was wrong. It's more obvious looking at the system hierarchy to see there's a problem. Anyone looking for the first time at the system wouldn't realise half of it's missing.
I've tried troubleshooting by taking out objects that look like the cause, but nothing in general changes. Any other change is that I script objects with Mass/MassSol instead of Class.
I started my own build of The Verse (Firefly/Serenity) using the spreadsheet technique and it currently works. And I reload the most recent version before the spreadsheet and it works.