Won't let me change font and paper colours in Compose

Hello, I a changing the colours of the font and paper in the compose preferences, but they will not take.
I can select the new colours but when I go to see that they have changed they remain the same.
Thanks for your help.

One thing worth noting is that you can load the Preferences panel while you are in Composition Mode, that makes playing with new colours much easier as you can see the results immediately. That said, you shouldn’t have any difficulties changing the settings the way you have been. Do any other preference settings work? If you haven’t tried restarting the software yet, do that, and if that doesn’t help the next thing I would try is resetting preferences.