Do you mind opening one of the older photos (that matches the screen) in Photoshop and showing me a screenshot of your screen?
Then do the same with one of the newer photos?
Whoa.
Then this can't be a problem at your end, surely?
Have you changed labs, or is it still the same lab?
Can you double-check that Photoshop's Color Settings are on "North America General Purpose 2" the way they should be?