Been playing for about 220hrs when I ran across the CTD when FT or on footing into the Castle area.
I've tried a plethora of possible fixes (listed them all in anther CTD post). In my downtime I've been reading up on all the problems surrounding the Castle area and it seems to me there are quite a few loose ends that could be instigating what appears to be a broken zone in the game.
Thought I'd post this to as a repository so maybe people could list out the problems with this specific zone to make trouble shooting what problems may be related or even cause & effect.
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Besides my obvious CTD when trying to get anywhere near the Castle area, I did have another odd thing pop up in the timeline just before my savegames started going bad.
During the Taking Independence quest, after slogging thru some raiders and mutants in the South Boston approach I moved toward the Meetup with the Minutemen marker. Upon reaching the little demolished store just west of the Castle I noticed my quest marker was suddenly several blocks back west. I headed back and found that Garvy was still on his way. As we got closer to the Orig meetup the marker again moved back on the map and Garvy just stood in an Alley way... my first CTD with this area occured.
Restarted and loaded about 5 minutes back, Garvy seemed to move up to the Meeting position. Talked to him, set up the firing line, went in to draw out Mirelurks...CTD upon entering Castle grounds.
Rest of quest seemed to work okay...other than one of the Minutemen started to shoot a dead Mirelurk body for about the next 20 minutes as I cleaned up the grounds, hooked up electrical and radio. Went over took her gun away, assigned her to a defense position. She ran away found a flamer and proceeded to shoot where the Mirelurk had been.
The whole quest/area was really weird...