I have the same issue with Photoshop Elements 14. It was fine with 9.1.1.
This didn't work, still get the same...
You are referring someone with this issue to a 2011 discussion on ephotozine? Where about the only sensible posts are made by GlennH(don't muck about with proofing and check your monitor profile) and the rest is hearsay or misinformation?
Wow. Just Wow.
On the issue at hand: It might be a problem with the monitor profile. Wouldn't be the first time.
Might also be a bug.
For a color profile error (assigning the wrong profile) I'd expect a different difference: wrong colors and contrast, not an image that darkens by almost two stops.
On the monitor profile: I assume you're using gamma 2.2?
The screenshots look the same here as they did in ACR/PS?
What did this image look like in ACR 9.1? As in PS or as in ACR 9.2?