Had an instance of a building that was unfortified (no barricades, curtins etc), quitting and than when I reloaded the game, the entire building was partial barricaded with all windows having a curtin
This happened at the giga mart building in rosewood (I assume it would happen elsewhere, but could just be this building if no one else has reported it)
few things to note, the game was taking awhile to close so I had to force close it (after about 1-2 minutes, which may have had some impact) which cased the game to go back to a auto save, which was about 10-15mins from where I had been prior when I tried to quit, this could be the reason for the change some kind of corruption.
I have no mods, and am on IMBUMS latest