I have the same problem with a 3 monitor setup. I´ve already proofen with a fake profile (with intentionally totally wrong colors) that ACR is picking up the wrong display profile. If ACR is "living" on the primary monitor (in Windows monitor setup), it´s picking up the profile of the monitor, on which Windows is booting! In some cases this is not the monitor that you´ve set up as primary monitor in Windows. To give an example: I have a GTX 970, which has a Display port, 2 DVI ports and an HDMI port. It is always booting on one of the the DVI ports. You can not change this! The monitor in Windows, however, that I want to be the primary monitor (because it´s the biggest one, also has wide gamut etc.), is connected via display port. So I´ve set this up as primary monitor in Windows. I´ve also assigned the correct monitor profile in Windows´ color settings. However, ACR does not care about it. For ACR the primary monitor is the one, which the OS boots with. So it takes the wrong monitor profile. This is a big, big bug, which makes ACR totally unusable, because colors are oversaturated on screen in my case. This did not happen in ACR 9 and earlier versions, never happened and happens in any version of Lightroom and does not happen in Photoshop. They all pick up the right profile. Please Adobe fix this!
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