This proplem wasnt in 1.1.17, this proplem came to me too at 1.1.18 Terrains got big holes in it after walking while, also some plants got weird and big :/ You could try Fallout D3D patch
This proplem wasnt in 1.1.17, this proplem came to me too at 1.1.18 Terrains got big holes in it after walking while, also some plants got weird and big :/ You could try Fallout D3D patch