@joshuawg said:

I didn't need to try after a nice restart. Everything's working.

 Nice, happy to hear everythings working :)

@callie said:

project with 3 projectors in a 3x1 layout.

 Are you using projection blending?
As @Woland mentioned, we will need to look at your full configuration to fully understand what is happening.

@dusx No, but I will do that, thank you.

@bonemap @jandraka 

Performing a little bit of thread necromancy since I ran across this and wanted anyone who ran across it in the future to know that, as of Isadora 4, the Button Control has Control Properties for the color of the button in its on and off states:

The method of using a picture is still totally viable, and can be nicer if you want to include a fancier-looking button designed in Photoshop. Also, it's worth noting that you can use images that have alpha and the alpha will be transparent on the button in the Control Panel and you can make some pretty neat buttons that way.