Currently, I am experiencing issues with Terrain Transparency on both Snow and Grass maps. The local non-collidable flora is still visible giving me a rough idea of how the terrain is sloped etc. However, whenever I am facing an Interior Instance *building/object* I can see the entirety of said object through the terrain.
I have fiddled and tweaked with odd settings for the past couple of days trying to rule out an issue on my end, but to no avail. Including updating drivers and .dll sniffing.

As you might expect, this makes it extremely difficult to play.
The issue seems to have lessened after disabling anti-aliasing, *ie the picture above* but it is far from gone.
I've been building on, and toying with the Torque Engine for many years, and have never encountered an issue like this before outside of a world editor.
Addendum: The issue is not limited exclusively to terrain. When standing on top of an Interior Instance *ie the flag tower* I can see the tunnel and ramp below.