Not sure where to put this package-specific announcement, but I figured it would save some people a headache to make it visible.
Since the change to 0.6 there is a persistent issue with world age in Plots, particularly when using the new Juno version.
The solution is in each case to call the backend explicitly, e.g.
using Plots; gr() – (or
inspectdr(), whichever suits your needs and taste the best - or simply, as a general solution,
backend()). This should be a temporary workaround only.