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I have the same problem
Still happening in v5.1.0f3 and v5.1.0p1.
I filed a bug here : http://fogbugz.unity3d.com/default.asp?705045_h4eivjqu0aboibac
Found the properties on the MeshRenderer. I made a little component that store the values so they can be applied at runtime when the Awake is...