OK, I just figured it out.
When you’re selecting a color for title lettering on the Color Board
if you use Master, it also colors the drop shadow regardless of
the color you select in the Drop Shadow area.
The same it true of Shadows on the Color Board.
Midtones seems to have no effect on the drop shadow and doesn’t
change the lettering color either.
If you use the Highlights to color the lettering, it changes the color
but leaves the drop shadow at the color selected in the Drop Shadow effect
panel.
Case Solved