I managed to fix this by doing a complete clean reinstall of Skyrim and ALL of my mods using my original notes on load order, etc. My final anylisis is that, by trying to implement a bashed patch, I caused things to conflict which caused the game to fail. It did take quite a bit of trial and error, since there are SO MANY dependencies with how complicated my mod order and save game are. For a while there I was able to load a cell in one specific save, but saving after that or trying to go into the overworld cell would cause a silent CTD with no hints in the Papyrus log. In other news, I now a have a perfectly updated, cleaned, and properly modded Skyrim install & a laboriously cleaned save fine. And a LOT of notes. You'll notice some LL mods in my list -- these need to be setup in VERY specific ways and installed IN SPECIFIC ORDERS even with Mod Organizer. I have no idea why it makes a difference with MO, but that was the final thing that made all of my saves playable and stable again. The other thing I found was that while I'd installed ENBoost for performance gains, I'd failed to actually, you know, install most of the ENB shader series etc. Oops. This caused me a weird bug where I could load a game and about 2 minutes later it would silently CTD.
