Terain Material problem

[Hourences]

The terrain has too many or too complex materials, it has reached its limit, and turns funky as a result. Reduce the number of materials, or simplify the materials used. For most terrain materials you just want 1 diffuse and 1 normal map texture hooked into the material.

[Zero713]

Hi, i was creating a terrain in udk and every once and a while i will add a material that will cause some wierd blue,pink, green texture to take over a great amount of square area. Any idea on what im talking about and how to fix it?