Join Date: Apr 2007
Location: Chili, NY
Bikes: 88 Fisher Gemini tandem, 92 Trek 970, 07 Nashbar Frame, 08 Gary Fisher Paragon
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You would be surprised at what can hang up even the best of derailleurs.
There is a multitude of things that should be looked at:
1) Loose cassette
2) Worn cassette and chain
3) Bad inner wire
4) Bad cable housing, kinked, worn, bad ferrule
5) Dirty Shifter
And these are just the start! My guess is a bad wire or housing.