I'm not entirely sure what the "chroma bug" is but I think it's related to some kind of jagged edge effect. If so then I have just seen it on my 868/504/HDMI set up. It's the scene on Star Wars II at the start of the film, when they're all in the conference room. The effect can clearly be seen on Samuel L Jackson's head outline against the red background. The 868 is set to output 1920x1080i so I wonder if that's got anything to do with it... If this isn't the chroma bug then please disregard this thread.