Thank you for reporting the issue, it looks as if the Lighting is not on.
A workaround might be to simply toggle the 3D Layer On/Off to see if that forces the Layer to re-render. If that does work then it gives us a bread crumb to what might be happening on 3D text generation.
Another check would be to change lights > click in the Scene Panel on the Infinite Light and change it to another light Preset.
One more idea > > click in the Scene Panel on Environment Light and increase the intensity > does that reveal the correct text colors?