This isn't related to the previously reported colour change.
Like you, I think it's a rendering problem by Google, which I hope will only be temporarily.
You might also notice using Google Maps Satellite isn't working at all in Journey Plotter.
At the moment, I have no solution for either, other than perhaps use Bing Maps.
Google has changed services for their online products a year or so back, hence the difference between JP and Google Maps in your browser.