Considering people are getting it at multiple locations and loations that they previously visited just fine I highly doublt it has anything to do with cells. I highly doublt beth went to the trouble of changing that many cells based on some obscure triggers. More likely either save corruption for what ever reason or just as likely some global setting that gets changed for one reason or another and doesn't sit well with some trigger checks in one place or another. Who knows...
I'm at 2d13h and everything still seems to work.. mostly. Then again I did about 4 quests... and just barely left the porch. Just the usual settlements losing their bloody resources till I physically load the cell. No serious "bugs" besides that. Building nightmares aside... god forbid you want to rotate that floor this way and not that way and find you you now have to spend 2 hours looking though out all the nearby built structures to find that ellusive one that prevents the rotation from being possible... good god.
Ignore the rant unless you are really bored:
It's been more then a decade since beth released something that wasn't broken in more ways then not and since they gotten extra important it's pretty much left to "others" to fix their games. So this could get completely ignored and instead patch will fix some localization UI issue or some such.
Here hoping for a good unofficial community patch and hopefuly it wont turn into opinion enforcement like with skyrim, that got to the the funny point of having a patch to fix a patch that fixes a patch. Tsk. At least Fallout doesn't have spell absorption... Or they would screw it up even after 20 years doing it over and over again(the hilarity of opening CS after every new dlc to fix something you know they screwed up without even needing to see it).
Ah well... This is still a pretty damn good game(buggy as it is). And it finally smells like an actual Fallout! Guess anything is possible Now all I need is for TES VI to actually somewhat look a TES game and not a generic rpg and I might start liking beth again... just a bit.
Also... why can't I get bloody spell check to work... my interwebz grammar makes even my own eyes hurt... and I come with tollerance towards typos ~_~