I know nothing about "textures", but after installing this morning's patch, the appearance of the Howling Mountains area has changed drastically. It looks rather as if the ground is made of much larger tiles than before. Gatherable resources look as they always did, as does my avatar. The minimap (upper right hand corner) looks a little odd, kind of like it too often does inside instances - the ones where I can't easily distinguish walls from passages, and have to rely on the "m" map to get anywhere - that only working after installing an add-on.
Varanas appears normal - but for what it's worth, I was there on a different character, different instance of the client - i.e. I launched 2 copies of the client, popped onto my main, briefly, and all was well, then decided to finish a quest on a low level alt, and found I couldn't see clearly to navigate.
My client was originally downloaded and patched at around chapter 3, but it's been fine so far.
I fear I'll need to reinstall, and I'm dreading it - typically it takes days to patch up to current, starting from whatever download is available on the site.
Any other suggestions?