I am running the Distribution platform directly from JMP but I get the same result if I execute a script for a distribution analysis. And yes, the setting has been enabled:

Despite having it enabled and choosing yellow to have the greatest contrast, (my preference is a green but that's too close to the default), I still get this:

I can then change the bar color in the graph, so this is a relatively minor inconvenience, but it defeats the purpose of having preferences in the first place.
I've tried running that script you sent, but I must not be doing something right (scripting is not my forte) because nothing happens when I enter it into a script window and hit the run script button.
Thanks for your time on this.
Regards,
Steve
Forging ever onward,