Did cleanup, saved under new name, closed wings, loaded new file, did some editing as before, tried to save normally with ctrl+s, same issue.
Oh also, just noticed. Once this occurs it says "Saving: renumbering" at the bottom, and for every save attempt it adds another ": renumbering"
Oh also, just noticed. Once this occurs it says "Saving: renumbering" at the bottom, and for every save attempt it adds another ": renumbering"