f.lux had major problems. There was some sort of weird issue that seemed like they were not unpremultiplying colors before shifting the colors, so you'd get the

f.lux had major problems. There was some sort of weird issue that seemed like they were not unpremultiplying colors before shifting the colors, so you'd get these weird blobs of color that either didn't have the color shift applied or were just the wrong color in the middle of videos. It was quite annoying.