Posted: 19/08/2012 at 10:54
Most likely there's nothing wrong with them, filmbuffy. They're changing colour on the way to maturity. Most toms mature from bottom to top, hence the shoulders are the last to change.
If the shoulders remain green:
Green shoulders can be a variety trait. What's the variety?
Shoulders that don't fully ripen - and, for that matter, uneven ripening in general - can also be a sign of toms getting a bit too warm in direct sunlight.