After many years of working flawlessly I have run into a problem on my new laptop. The laptop has a 3200x1800 resolution on a 15" screen, and uses text scaling to make sure everything looks normal. I think color cop only reads the resolution and applies the mouse cursor position to that resolution. But because the screen is scaled, this offset is no longer correct and the pixel color is way of from what it is supposed to be.
Since these super highres monitors are likely to become more mainstream, I wanted to give a heads up to this problem.