Hi Brian,
My laptop (2016 MacBook Pro, running OS Monterey 12.0.1) started doing something weird last night. You know how in ACR the darkest parts of the image (where the detail is lost) will be marked in red? My monitor looks like that, but on every screen (not just in ACR/ photoshop). It seems to be mostly on the darkest edges (outlining browsers, framing the Br of the bridge logo, etc.). I tried restarting and the issue persists. I've attached a couple of screenshots to illustrate. Is this something you've come across before?
Thank you!!