First of all love the program!
I have an error on a model that has taken hours to generate instructions, it's still incomplete but I wanted to export a PDF to copy complicated assemblies on an adjacent side which I have been doing as there are similar assemblies.
When I have come to (Re) Generate from steps i would say 90% of the steps seem to work where others generate an error.
I have searched and searched for ghosted sub-groups? but I may be overlooking something.
from what I can make out there are at least 2 assemblies which generate the errors X1397 & X1172.
I have included a link to the blue-note file & error log as below via Google drive.
https://drive.google.com/file/d/1_79-jCq_i7dTNDnzj8w_s-g2a2yxQsXu/view?usp=sharing
Hopefully somebody can help, as I would be gutted to lose it all to not be able to generate steps.