I have two external Dell monitors running through a Thunderbolt 3 dock to my 15" MacBook Pro. On the 2nd one that I connected, all pure white colors show as a very vivid and bright yellow, much like a highlighter. No other color is affected, and off whites render fine.
Whats odd is that this monitor has this issue regardless of how I connect it to the laptop. Its broken via dock, or via direct DP to TB3 cable. It also has the issue while being the only monitor connected. The original monitor does not have the issue regardless of how I connect it.
This would imply a hardware issue with the monitor BUT I have confirmed the monitor works correctly on a windows laptop. Whats also odd is there's a split second after login that the colors are correct, before they go yellow. This also suggests the monitor hardware is fine.
Both monitors are running in forced RGB mode, but this did not correct the issue. PRAM reset also had no impact.
If I go into color calibration for the monitor, everything is fine so long as the target white is below 6500k. 6499k is fine, but the moment I raise it to 6500k (which is the default) the whites snap to highlighter yellow. They remain so for any value higher than 6500k.
Has anyone ever experienced anything like this?