While going over the examples in the tutorial "Advanced Manipulate Functionality" I'm struggling with the apparent ramifications of improving

Manipulate[
 Plot3D[Sin[n x y], {x, 0, 3}, {y, 0, 3}, ViewPoint -> {2, v, 2}, 
  SphericalRegion -> True, Ticks -> None], {n, 1, 4}, {v, -2, 2}]

by using "Dynamic" as directed:

Manipulate[
 Plot3D[Sin[n x y], {x, 0, 3}, {y, 0, 3}, 
  ViewPoint -> Dynamic[{2, v, 2}], SphericalRegion -> True, 
  Ticks -> None], {n, 1, 4}, {v, -2, 2}]

I see that the improvement works as stated. However, with the "Dynamic" version I can no longer use the mouse to change the orientation of the 3D figure. When attempting to change the orientation with the mouse I get a zillion identical errors stating

         Set::setraw: Cannot assign to raw object 2. >>

How can I use the "Dynamic" version but still be able to change the orientation of the figure with the mouse? (I'm using Wolfram Mathematica 10.0.0.0 with Windows 7.)