DR return strange bucket

[fraggle]

Hello, I can't find out what happens to some of the bucket using DR.
Same version is on all slaves and this never happens before. It's like an anti aliasing or Ambient occlusion problem, not sure.
Thanks

[Pixelcon]

Is it a missing plugin or something in the modifier stack isn't working? Have you tried collapsing to mesh and removing any plugins in the material?

[fraggle]

exact, The quad chamfer modifier make the slave bucket look different (like no chamfer at all).
I have to collapse all the mesh before rendering.
Thanks