Did you recently change the chain? What "speed" chain and how many cogs on the rear of your bike? Did you recently change the crankset, what "speed" crank did you get?
Did you recently change anything else? FDR maybe? You know what the next question is.
However, it might just be that you don't have the cable put into the pinch bolt the correct way, or something has gotten off with the way it's routed around the BB.