> Have you properly re-set-up your portrayals in your load() method?
Hm, yes. It calls setupPortrayals() as does my start() method.
I tested also to create a checkpoint directly from the GUI and then
If I quit and restart my GUI, also that checkpoint is black.
But if I only quit the simulation without quitting the GUI itself, and
then reload the checkpoint, the Portrayal shows my agents as it should
be, but the display is frozen. I.e. if I unpause the simulation it runs
but the Portrayal just shows the agents as they were after loading the