Textures missing?

I've noticed that it seems like some textures are missing on some of the tracks. Among them include:
Is this a known problem, or is it something on my end? All of these have persisted through several updates, so I'm wondering if it is, in fact a problem on my end.
- Zen Garden -- Everything except the karts and items is flat black. It is impossible to drive on because you cannot see the track.
Old Mine -- The tunnel-like passages seem to have texture, but the rest of track itself is flat black. Environment objects do show up, though.
Blackhill Mansion -- A few patches of grass, the mansion itself, and most environment object (except the bridge) are flat black.
XB591 -- Most of the environment objects are flat colors, making for a dull experience. Additionally, the track is barely darker than the ground around it, making it difficult to follow the track.
Is this a known problem, or is it something on my end? All of these have persisted through several updates, so I'm wondering if it is, in fact a problem on my end.