Procedural Mesh lines with AA

AA and a procedural mesh does not seem to work well together. I found that enabling AA x 2 makes a small blurry white line around the mesh and as the AA increases, the lines get more defined. The mesh triangles and vertices are all arranged correctly and it should work, but for some reason there is a white line around each of the " blocks " .

2 x AA : http://i.imgur.com/7ncKhG8.png

4 x AA : http://i.imgur.com/BfYGj1Y.png

8 x AA : http://i.imgur.com/xUOmpux.png

no AA : http://i.imgur.com/O7DpIO4.png

The whole thing is a single mesh, so it should not cause issues.