I think you are saying the problem has something to do with the objects not sitting on the bottom.
Can I just move the objects downward to get it back to the right place, and function? I would rather not lose the entire object file, since these were solids that I did not extrude from footprints. There are dozens of buildings that I do not know the heights to for this workspace. When I attempt the
ProjectToCPlane it flattens all the objects along a single plane, leaving no footprints behind.
Could it not have something to do with the BuildingSolids component being 1.3.1 while the rest of the model components are 1.3.0? I do not know how the BuildingSolids component ended up changing the version without the rest following suit. I copy and pasted direct from_building_solids, where the component is 1.3.0 all around.
Update:
I switched the component back to 1.3.0 and scrapped the old workspace. The 1.3.1 component would not leave any of my older functioning workspaces with solids. It could have been a combination of the component and a geometry problem. Having no success with CPlane corrections in Rhino, I used an old workspace instead of continuing to fight with whatever the geometry problem was. I believe the 1.3.1 component snuck in by running LB Versioner at some point.