Ground problems

I am trying to create a flat ground for my little test game I'm working on. I tried using CreateCube to make a quick mesh, then use ScaleMesh or ScaleEntity to make it 200, 1, 200, and finally use EntityTexture to texturize it (or even EntityColor to color it). But, when I move the camera around it alternates between blackness and the texture or color.

Global ground:TMesh=CreateCube()
ScaleMesh ground, 100, 1, 100
PositionEntity ground, 0,0,0
EntityType ground, 2
EntityTexture ground, tex[0]
' or EntityColor ground, 255,255,255

I tried another way, which was creating several different meshes, and using AddMesh to combine them. This looks fine, but collision stops working after I make the mesh too big (like more than about 160 X units by 160 Y units).

Any suggestions on what I could do differently?

you might have to keep placing your 'addmesh' mesh back at 0,0,0
all the time,

if no-one else has any better suggestions

I am using a plane mesh created with Milkshape and it works fine.
When using a cube may be worth trying to use fitmesh:

"Scales and translates all vertices of a mesh so that the mesh occupies the specified box.
Do not use a width#, height# or depth# value of 0, otherwise all mesh data will be destroyed and your mesh will not be displayed. Use a value of 0.001 instead for a flat mesh along one axis."