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I can confirm this with an easier example:
sage: var('x,y')
(x, y)
sage: f(x,y)=x^2+y^2
sage: p=plot3d(f,(-5,5),(-5,5))
sage: p # works fine
sage: p.save('test.sobj')
sage: q = load('test.sobj')
sage: q
NotImplementedError: You must override the get_grid method.
I will try to look into this later; it's puzzling to me, since we get
sage: type(q)
<type 'sage.plot.plot3d.parametric_surface.ParametricSurface'>sage: type(p)
<type 'sage.plot.plot3d.parametric_surface.ParametricSurface'>
as expected.
