I recently discovered global colors, which is itself an extremely useful feature. I decided to start using it across my current project, as it was exactly what I needed for characters that needed consistent colors across the hierarchy.

Unfortunately I've found the palette very difficult to work with.

• When I create a color, selecting it in any way applies the color wholesale even to layers I do not have selected.
• Something gets messed up in how it pushes to the Undo/Redo stack, also, because pressing Ctrl-Z often skips over the layers it applied the color to and goes to previous steps (though this is not consistent). I often end up needing to remove the color manually and set it back to the original global color I had set.

In testing, when I tried to create a new color, clicking on it overrode my already-created global colors on any objects that used them.
I've included a shot of the bug in action. Note that I have a single layer selected, the one I wanted to color (the tongue).

If this is not a bug and I'm using this wrong somehow, then I'm happy to correct whatever I'm missing. It is a very useful feature that I'd absolutely want to incorporate in future projects.