When I go into comparison mode with a reference image and do any adjustments on the original image, then the reference image is flickering! This is very annoying, as it is very difficult to match the colors of the reference image that way. The flickering is especially visible if the image contains small patterns.
This is on a Mac with PL9 trial.
I am starting to get disappointed. I was so happy when I read all the great improvements of PL9, but only within the first hours of testing it I am discovering bug after bug.