Copy-pasting from the tech support thread:
So here is the issue: having reinstalled after a few months break, I can no longer use Outfit Studio to remove armor pieces from .nifs to make clothes and armors sufficiently skimpy to my taste. Once having removed a piece, the armors cause instant ctd on Equip.
I don't know if this is something new, or something I just haven't run into before?
Also, a related (?) issue: specifically with a UUNP version of the Asker Sandrine cuirass. I wanted to remove the under-shirt to leave one breast bared. I did so, exported the mesh, loaded the game, and the top section originally covered by the under-shirt was simply gone. I said to myself, 'That's probably because they masked away the body .nif to reduce clipping'. So I deleted the body .nif, duplicated my UUNP body, copied over the bone weights, and.... CTD on Equip.
Now, the only person to reply to that post mentioned skin partitions? Should I ...add that to the duplicated UUNP body or... I'm really very lost.