I currently have 2 (identical) monitors connected to my PC, both using DP, and one of them has a slight yellow tint to it. This problem has persisted through new monitors, new graphics cards, new cpu/motherboard, and a fresh install of windows.
Did you happen to find a solution to this problem? I have a similar problem, mine started when I plugged my external monitors back in after using my laptop on the road. I replaced the monitor and the cable, to no avail.