I have the same issue in regards to my chest. I have been working out for a long time with little to no development. Granted the majority of my time working out I was a) not taking in appropriate Protein and b) over training.
However, my point is that recently I changed my routine up. I normally do flat bench 3x10, then incline smith 3x10, then cable crossovers 3x10. This is a generalization. I actually change my reps and sets and change out my cross overs for different "finalization" sets.
The recent change i made was going from flat bench to flat dumbell's. OMFG! Now i admit i have lost some weight (still not as low BF as back when i was in better shape) but my chest has grown an unbelievable amount. I actually began to shave my chest because, though it isnt huge, it looks unreal to me in comparison to what it has been in the past.
I am going to start some variations of my current workout (Incline smith 5x5, flat dumbell 5x5, decline smith 5x5) that remove the smith and use dumbells instead. dunno about anyone else but I have found a new love in dumbells.