Any idea what this message means? "The blueprint cannot be altered, its data is saved separately to allow restoration of modded content."
Sometimes while playing i realize an error and i just want to update the live blueprint without going to my bp100 save. Usually this is not a problem. This time, this showed up on stage 8. Stage 1-7 can be updated all i want - no issue. But i cannot make changes to the stage 8 bp and this message appears in the upper right side of the bp view. You cannot change anything on the BP while this shows - name, icon, description, snap, position, components, or the usual buttons for modules, train stops, vehicle fuel, etc. Nothing. You can only view/close the BP.

Hey whimzero,

I think this means a modded entity snuck its way into the blueprint.

With the blueprint open, check the items required to build the blueprint; there might be some entities marked (?).
Make sure you didn't accidentally have modded entities in the build.

However, if entity has bp_100 in its name, then this mod is suspect.

A perhaps workaround is to re-take the blueprint, after rebuilding the offending stage.
If there's still an issue, and if you can find a way to reproduce it, that would be great.