This pertains to the Vault 34 side mission. When in the facility upon entering the Armory for some reason if you save the game around the door it will not reload. The game locks up when trying to load and sometimes I get a message "The DLC for this area is no longer available, do you wish to proceed", then it says "Drive not present, or unable to retrieve data"(something like that). All other areas of the facility seem to be fine. luckily only files that were corrupted were those in this area.
 
Also good luck, this area is a mf'er.
 
 

I went down there but I didn't have a quest active so it just ended up being a Ghoul mass-slaughter