@Riverwood freezing
I thought about it again, and the save that I use to test AV actually experiences a similar freeze/CTD when walking from the warrior/thief stones to Riverwood. I just assumed it was a bug because my save was from one of the first Skyrim release versions and I didn't feel like trudging through the intro to make a new one based on the newest skyrim updates. However, if you're experiencing similar freezes, then it may be something legit. I guess it didn't click with me earlier that you were talking about the same area. XD
So you're saying you get the freeze only when you use AV + RWS? I'll see if I can recreate the error sometime this week and investigate into what's causing it. 8) Might not even be related to AV at all, but it's worth investigating to find out for sure.
Yes, that's the exact area! It's nice to know that you have seen a similar issue.

(or maybe

)
However, I did not get that problem originally. It just suddenly started happening for no apparent reason, thus my days spent trying to solve it at least to the point where I could play again.
I cannot say that it is
solely due to AV. The problem happened even when I deactivated AV (and ASIS, for that matter).
I can say that deactivating SkyMoMod and RWS fixed the problem. In fact, the game is running more smoothly now than ever. I did have a couple of freezes earlier today, but overall, the game is running better than before, and certainly had no problem in that area (although it didn't a week ago, either, so maybe that's not such a big point).
I thought that it might be some kind of interaction between AV (and/or ASIS) and RWS, though. Or perhaps pulling something from the Bashed Patch but the "something" was not quite right.
I didn't attempt to reactivate SkyMoMod to test it, either. I am tired of the first part of the game and I needed to get farther in order to do some work on my own mod.

Mind you, when I test, I play from the very beginning every time (in this case, that is... not if I was adding the mod in the middle of a game, of course).
Another thing to note is that I play with the Personalized Music mod. However, I also tried deactivating it when I tested and the problem still happened. I only mention it because the music and transitions are smoother now without RWS, for whatever reason. It's noticeable, at least to me, even from a week ago when I was playing with all four creature mods.
It may just be one of those intermittent issues that can't really be tracked, but if you happen to look at it and find anything, please let me know. It certainly isn't because of your save being an early version, though. I'm sure of that, at least.
The major concern that I thought might be happening is if a mod, any mod, had some type of internal issue but the issue didn't usually appear. However, it occurred to me that AV and ASIS might interact with the mod and its issue in such a way that the problem suddenly becomes much more apparent due to propagation effects in the whole system.
PS:
Lev, about facegen... there is a new mod that I think is just starting, but it an attempt to make a facegen exchange feature for characters. Maybe the author of that could share some info on this problem?