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I finally found a fix for my case(though I think this fix only works for my case, I didn't see SkyUI in your load order); I've been noticing that whenever I ran the game SkyUI was automatically disabled, so I re-installed it through NMM and just didn't touch the load order at all. Guess what, it worked. I can finally save.

I have been having a seemingly identical issue, it happened ever since I rolled back from the new SE update. It seems to be retroactive for some reason affecting all files with SkyUI installed, which makes little sense if it's a script issue. I do, however use Warzones 2015 which is relativly script heavy, and my build relies on the ritual stone to revive large amounts of enemies to fight for me, so guess that would make sense. I tried re-updating to the newset version, and load the save both with and without SkyUI to no avail. I'm not really sure if it's a coincidence that this happened right after rolling back from yesterday's(3rd of April 2018) update. It happened on my 97th save, approx. 120 hours of playtime. Since it seemingly only affects the saves I made after installing SkyUI, I would assume cleaning the saves of any SkyUI data would help. Problem is, I'm not really sure how one goes about doing that though. Hope it helps. Edit: It is worth mentioning though, my charcater recently died in apocrypha which means he respawns where he was before reading the black book(doesn't actually kill you), as I recall it from yesterday, I tried reading the book again, and my game froze, the bug happened ever since. Edit2: So I reinstalled SkyUI and now I got some Juicy errors: https://imgur.com/a/oAcGX