Ay, I wish it was better news.
I have tapped into somewhat similar issues with other games.
A similar texture issue arise in Fallout 4 if you use ENB, and have it to use more ram than you acutally have.
I'm pondering if there is a setting in some ini file that should be toggled of or is incompatible with certain hardware.
Overall though the hardware on our end who suffer the issue though, seems to be spread out all over the field(so I dont really think its the hardware/software specific).
There is also several other post about the issue I see on the forums, so it seems like a "common issue" and something they should fix, as its at the very least makeing the game unenjoyable, but also in some cases unplayable(like sieges etc).
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Edit so I tested in terms of me thinking it was the same issue as with Fo4 and ENB(note I dont use enb's if there is any, nor do I use mods at all).
However my theory is that its soemthing to do with memory and textures, and the engine not useing memory correctly.
I turned down the performance to "Very low" from my custom setting, and boom.
While the game didnt look pretty, atleast the issues of the blurry textures, pics now showeing etc seems to be gone.
I'd like others who is struggling with it, to just test play some with it.
Ideally also reload a save, as for me I typically had the issue occur more frequent if I reloaded a save(I'll be honest : yes I save-scum)
But dialing it down to very low seems to have "fixed it" on my end.
Fought in 2 battles, entered 4 towns, 7 villages.
Looked at clan and kingdome menu, encyclopedia, crafted, went out of the menu into character lvl'ed up, back to crafting all the items shown properly.
In all the towns I opened barter menu, same for villages no issues.
So if anyone could try to replicate it, it would be appriciated and or if it works for others *hooray*
Then you can dial up the graphics slowly and see the breaking point for stability vs beauty.