I have a single-screen setup so can't test this, but out of curiosity - is the Photoshop main window on your primary (standard gamut), and ACR on the secondary (wide gamut) when you see this?
I have seen reports of ACR using the wrong monitor profile a couple of times, although those were all Mac. But it can happen. Can't recall what the solution was.
Hi, thank you for your reply. This problem presents whether Photoshop is open on the primary or secondary monitor.
For anyone else experiencing the same problem, here is a temporary workaround that works for me. Photoshop's Monitor RGB reflects the ICC profile of whichever monitor was designated the main display in Windows *at the moment Photoshop was launched*. Any subsequent reassignments of the main display are not detected by Photoshop until the application is relaunched. ACR (for me) is locked to the ICC profile of Photoshop's Monitor RGB. Thus, it is possible to force ACR to use the ICC profile of the secondary monitor as follows:
1. Close Photoshop.
2. In Windows, right click desktop > Display settings > Display tab (top). Or in Start menu search for "Display settings".Click the box 1 or 2 that represents your secondary monitor. Check "Make this my main display". Apply.
3. Open Photoshop. Monitor RGB should now reflect the ICC profile of your secondary monitor.
4. Repeat  but now undo the change you just made, making your primary monitor the main display once again.
5. Confirm that Photoshop's Monitor RGB is still set to the ICC profile of your secondary monitor.
6. Confirm that ACR now displays correct colours on your secondary monitor.
This workaround ensures correct colour management until Photoshop is closed.
+1. Experiencing the exact same symptons, and I do believe that this is a bug that has been introduced in some recent version of ACR. Did not happen previously.
We've seen quite a few of these lately.
Yes, I smell a bug here, but as I said I can't test for myself. Try to swap main/secondary display in the OS.
As Joe__ reported, it's about the designated primary monitor when Bridge/Photoshop start up, specifically. If I close the program, set the main monitor to the one I use ACR on, then the color profile used is consistent between the Bridge previews/Photoshop, and ACR.
For others running into the problem, a workaround I've found is simply to assign the color profile of my ACR monitor as the color profile on my main monitor as well. In my case my secondary ACR monitor is the calibrated one, and the main monitor is a larger but uncalibrated one. So now the colors on the main monitor are even more off than usual, but I care less about this because it's uncalibrated to begin with.