Newbie: Smooth sculpting tool acting strange

Hi

My ‘smooth’ sculpt tool was previous working in the correct way, i.e. smoothing across the area you click and drag along. However, something seems to have changed and now when I click and drag along a surface, it applies a change only to the area I initially clicked, not the entire area I dragged along. Any ideas?

Let me know if I have not explained this clearly enough.

Thanks,
Ben

What happens if you do this?

.Create new scene
.Add cube
.Tab into ‘edit’ mode
.Ctrl + W > Subdived (10 times)
.Go to sculpt mode
.Select smooth.
.Sculpt cube.