Reply To: Opacity affecting layers below

I don't know either but I got a similar bug(?) recently… changing opacity of one item in a complex document caused the background color to change on screen. The thing is, it was a subtle shift (sort of like switching between CMYK and RGB in other adobe products). The basic color was correct, it just seemed to get muted. And the color panel said its color values were the same. I suspect it's just a visual bug and the actual printed color is identical either way… unless the shift you're seeing is more dramatic than what I'm describing?