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Old 05-06-07, 10:56 AM
  #19  
HillRider
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Location: Pittsburgh, PA
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Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!

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With all of the possible causes you've eliminated I've also concluded there is a manufacturing defect in the new derailleur. Shimano has a 3-year warranty on Dura Ace so you should have no problems getting it replaced.
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