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Curl and Div problems


I'm having problems with VectorAnalysis package.

Within the documentation center, the package loads and works fine.

But in a notebook, it seems to highlight Curl in red and neither Div
or Curl works properly.

Needs["VectorAnalysis`"]

{D[x^2 y, x] + D[ x z, y] + D[ x^2 y^3, z]}

Div[{x^2 y, x z, x^2 y^3}]

gives different answers.

{2 x y}
0


Curl[{x^2 y, x z, x^2 y^3}]

gives

{0,0,0}


I'm on windows vista home edition, 64 bit, Mathematica 8.0.

Does anyone else have this problem?



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