Open the scene TrackEditor_Example from the attached project and press Play. It will throw lots of errors about materials missing some texture properties: http://i.imgur.com/BfbNb0h.png

These errors don't show up in Unity 5.3.0a1 or earlier versions. This is a regression introduced somewhere between Unity 5.3.0a1 (fa0e11261f8c) and 5.3.0b1 (7dfb4e0eab03)

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Won't fix since it's caused by a user error, his custom shader fails to compile:

Shader error in 'LevelEditor_DiffNorm': 'vert': output parameter 'o' not completely initialized at line 84 (on glcore)

As a result m.SetTextureScale fails to find shader properties by name. Which is perfectly expected behavior from our side.