The Reflective/Diffuse shader shipping with Unity 2.6.0 (haven’t checked 2.6.1 just yet) does not work properly when the object is lit exclusively with vertex lighting. Here’s how you fix it – it’s just one line.

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Shader "MrJoy/Reflective/Diffuse" {
  Properties {
    _Color ("Main Color", Color) = (1,1,1,1)
    _ReflectColor ("Reflection Color", Color) = (1,1,1,0.5)
    _MainTex ("Base (RGB) RefStrength (A)", 2D) = "white" {}
    _Cube ("Reflection Cubemap", Cube) = "_Skybox" { TexGen CubeReflect }
  }
  SubShader {
    LOD 200
    Tags { "RenderType"="Opaque" }
    UsePass "Reflective/VertexLit/BASE"
    UsePass "Reflective/VertexLit/" // <-- This is the new line.
    UsePass "Diffuse/PPL"
  }
  FallBack "Reflective/VertexLit", 1
}

Basically, the Reflective/VertexLit shader has two passes, not one and the Diffuse shader is only including the first one – the one used for the reflective term. The additional line adds in the second pass, and all is well.

EDIT: This only resolves the case where the object is lit ONLY by vertex lighting. In the event of pixel + vertex lighting, it still behaves as if only the pixel light was hitting it. Bah. Will suss it out later.