LineRenderer / Shader Disappears After 4.0 Upgrade

I had a project in 3.5 with the following LineRenderer that displayed a texture with transparency repeated along a row:

The "Custom/FlatTextured" shader is as follows:

// Unlit alpha-blended textured shader.
Shader "Custom/FlatTextured"{
    Properties {
        _MainTex("Base (RGB) Trans (A)", 2D)="white"{}
        _Color("Main Color",Color)=(1,1,1,1)
    }
    SubShader {
        Lighting Off
        Tags{"Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent"}
        Fog{Mode Off}
        Blend SrcAlpha OneMinusSrcAlpha 
        Cull Back
        Pass{
            Lighting Off
            SetTexture [_MainTex]{
                constantColor[_Color]
                combine texture*constant
            }
        }
    }
}

After upgrading the project to 4.0, it is no longer visible. Know what's wrong?