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Hello, when i open a raf, develop persona displays a totally black picture, like the same effect when i develop as 32 bit with "unmanaged" no checked in the preview ; without picture to see i can't adjust tones, i must develop and then come back to develop persona, but when i do that the higlights are definitively lost, so i had to quit my doc, re-open and i can just adjust exposure looking at the histogram, but not the tones (ecrêtage in french), and nothing of the rest, it's a problem, and it's cruel ... thank you ! oh i precise that was not the case with 1.5 version, and raf is openned as 32 bits by default, and the parameters to 16 bits does only work for the development, not at the first openning ! so as i can't check any "managed" like in the 32 bits preview before opening a raw, i have no solution !!! am i definitively out with my macbook late 2007 and Lion ? re-thank you !!