MathAction #433 viewport manager does not restart

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If somebody could fix this quickly, (s)he'd make me very happy:

In a fresh session:

axiom

o := point [0,0]

Type: Point Integer

axiom

v1 := point [1,0.5]

Type: Point Float

axiom

g := makeGraphImage ([[o, v1]], [red()],  [blue()], [6])$GRIMAGE

   Graph data being transmitted to the viewport manager...

Type: GraphImage?

axiom

makeViewport2D(g, [])$VIEW2D

   FriCAS2D data being transmitted to the viewport manager...

Type: TwoDimensionalViewport?

close the graphics window, then

axiom

makeViewport2D(g, [])$VIEW2D

   FriCAS2D data being transmitted to the viewport manager...

Type: TwoDimensionalViewport?

I then get

But nothing happens...