This has occurred in-game, whilst in different games but is entirely local.
Sometimes, when ROBLOX Studio updates, upon restart, a lot of textures just fail to load, and even some material surfaces may appear so degraded that it looks solid, I do not have a screenshot of the surface texture/material degrading, but you should be able to paint a picture of what I mean.
In regards to textures not loading in, they aren’t, at all, even after restarting, clearing cache, reinstalling studio and whatnot, but it’s never the same textures, it’s always a new group of textures that don’t load in, and it’s extremely frustrating, some roads are textured, whilst others aren’t.
When I load in-game, it doesn’t happen at all, all textures are there, and nothing is out of the ordinary.
ROBLOX is just in general loading everything painfully slow, if it’s loading them at all.
Edit: Apparently it will only load whatever is near it when I first log into studio, this time I tabbed out and logged back in to a spot far away from the city, everything loaded fine, but when I went back into the city, everything was of such horrible, degraded quality.