The obvious difference between the two is the lack of magenta on the OLD one vs NEW, both in the magenta fringing along the building-sky edge and overall.
So the OLD one is created on the other systems and the OLD smart object was applied to the merged layer, while the NEW one is a smart-object starting with the same merged layer but created on your system with ACR12, and what we see crops is the difference between you turning your new smart-object layer on and off?
Does this happen with any JPG with a simple smart-object ACR filter applied, perhaps with the default settings both in the original SO on the other systems and the new SO you create?
Obvious questions would be:
1) Are there differences between the default ACR settings on the old system and your system?
2) Did ACR 12 introduce some new setting and perhaps a new process-version that is the reason things look different?
3) Are there differences in the monitor calibration between their systems and yours that could account for the difference?
I think you've said or suggested this in the intial post, but it is your idea that when you had ACR 11 on your system the images looked the same between their systems and yours, so either ACR 12, itself, or the process of upgrading from ACR 11 ot ACR 12 changed something on your system that now makes things more magenta, and perhaps other differences?
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