Thanks Marc! I use a 5k iMac and I caliberate it every other month. I still work as a photo retoucher and self teach myself into DaVinci. I use a xrite i1 calibrator and my monitor is calibrated to sRGB now since all of my work resides on the net. I have been living with the color shift reality for a little while. But I was working slog3 with ACES in DaVinci and the color just look consistent all of the sudden. Not sure if you or others have the same experience.