Make sure your front derailleur is adjusted correctly. There are little screws which will adjust it in or out. Then I would make sure it is positioned correctly on the seat tube, or that the cage is not bent. It should be in perfect plumb with the chain ring. If it got kicked or something, it could be either spun out of alignment at the bracket attached to the seat tube, or the cage could be bent. I find it hard to imagine the cage could be bent on newer derailleurs.

Odd, unidentified noises drive me crazy.

Karen