The blend surface edge gets flipped, when you move control points of the concave input surface:

Thanks, I saw this too… filed as http://mcneel.myjetbrains.com/youtrack/issue/RH-30610
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The blend surface edge gets flipped, when you move control points of the concave input surface:

Thanks, I saw this too… filed as http://mcneel.myjetbrains.com/youtrack/issue/RH-30610