update on the GFX bug, I switched to a latest chromium browser and try again, only to meet with the exact same problem. I took some screenshots as well.
Oh wow. So it's definitely not the shaders - I can see the fog just fine in the far away objects. If it's always around the vehicle then perhaps it must be something related to the fake distance shadow I used, but that one is a small area around the vehicle (~2.5 meters or so). The plane is a very large object but it doesn't have that level of geometry to fail like that. Near camera clipping wouldn't do that either. The full black screen is a total mystery to me, probably a transition bug but humm. Sorry for the issues :(