This is probably nothing, but in the interest of being thorough (or Thoreau), I deleted and redownload WSFW and all three chapters. I'm going to try using a vanilla save after I have left Vault 111, but I'm still in Sanctuary.
Anyway, when re-downloading the mods, SS2: Chapter 3 was the only one which didn't automatically take its appropriate place in my mod order...I had to press X and manually drag it to just under Chapter 2. Again, probably nothing, and I know absolutely nothing about modding or coding or whatever the kids are calling it, but thought better to make a note of it than totally ignore it.
Hope everyone has a good, long weekend.