[LVL ED] Texturing and Geometry is strange

[physcostealth]

So here, we've got two problems going on.

First things first, the geometry of my plane is all messed up. In the level editor, it looks somewhat smooth and paved out but inside the game it appears ridged and artificial.

Secondly, the texture appears perfectly fine in the level editor but doesn't appear in the game (instead it just goes to default grey). I've tried deleting the msh files and any cached files. I'm just not sure why it's only affecting the game and not the editor.

Here's what everything looks like in the level editor. The texture is there, it just sort of blends in.

Spoiler below!

Here's what everything looks like in the game.

Spoiler below!

What can I do to fix this problem?

PS: While we're at it, is there a way we can change the sound the player makes when he walks on different surfaces? When he walks on water, he splashes. When he walks on land... it sounds like he walks on land. Any way to manipulate these sorta sound effects to suit the surface he walks on?