I think there’s a bug with Make Button node. When I click on the rendered button there are two events triggered on “Updated Layer” output (pressdown and pressup), but nothing is triggered on “Pressed” output.
Hm, the “Change Color with Button” example composition still works for me. Have you connected a cable to the Make Button node’s Rendered Layers input port? If that doesn’t solve it, could you post your composition?
Oops, you are right - it works fine after connecting Rendered Layers.