Sagemanifolds display has deteriorated

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Hi All,

I've noticed a deterioration in the display of objects in SageManifolds, I'm using the following code:

%display latex

R3 = Manifold(3, 'R3', start_index=1, latex_name=r'\mathbb{R}^3')
cartesian3d.<x,y,z> = R3.chart()

omega = R3.diff_form(1, 'omega', latex_name=r'\omega')
omega[:] = (y, z, x)
print(omega)
omega.display()

In SageMath for Windows Native 8.1 the display command would display the Greek letter omega. On the other hand in SageMath for Windows Native 9.0 and 9.1 the display command displays the word omega, not the Greek letter.

Is this a bug?

Daniel