actually ello is correct i have done alot of terrain work it has to do with the size of the terrain versus the scale factore of the texture
easy way to fix make sure when building you terrain that u use either 33 or 65 verts in both directions with 16 or 32 or 64 triangle size then write down how many time u scaled it up in wed say 10for example so example(65 verts 64 triangle size is a terrain size of 4096 quants scale up by 10 = 40960 quants
so texture scale factor say u want 1 texture for each 512 quants=40960/512=80
like i said easy fix just do the math

Makes sence but then again I've never been that adept at that new fangled mathmatics. It does work as you said but the vertex/triangle size doesn't have to be resticted. Any setting appears to work as long as you figure it out like you said. Thanks for the input and answers. Very helpfull.

yes but it is eaiser to move then around and line them up in wed doing is simillar to how i sugested