Photoshop Causes Monitor to Brighten Significantly, Adds Blue Shift

I've had a strange thing happen with the most recent version of Photoshop the last few days.

As soon as I click on the icon to start PS, the entire monitor screen brightens significantly. It also shifts significantly to the blue, cooling the photos. Once I exit PS, my monitor brightness returns to zero.

I should stress, this increase in the brightness and cooling affects all problems, not just PS, for as long as PS remains running.

I use a calibrated monitor. This strange PS behavior means I can't edit while PS is running. The results are too bright and too blue.

I'm running Windows 10 with 16GB of RAM and an SSD as primary drive and mechanical hard drive as the secondary drive.

Cheers,

Mitch