So the scene will be a simple large ground plane, with some tree props.

I have the ground plane laid out. Then I went to make a texture. Went into the material and setup a simple image map for diffuse color. The texture however loaded with the wrong scale. I figured no problem, I tried to adjust the U and V scale to compensate. But it does not seem to be changing anything in the preview. It is set to Tile and it is a tile-able image. I did some test renders and it seems that no changes are happening to the texture scale in preview or render. What am I doing wrong here? Help! thanks!