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Hi Gordon

Colours and saving file: I had similar problems as you write and found (for my work) following reason: working on one side with ProPhoto-RGB and on the other side with normal Adobe RGB. Since I made the whole workflow without ProPhoto-RGB it is working right. It's only an idea . . . I could imagine that Mac works with the "greater" "Farbraum" of ProPhoto-RGB . . . .
Kind Regards, Brigitte