A coworker of mine has this question, and it's bugging me that I could not answer it. The icon representation of a mask in the layers palette has a distinct pink tint. It's not the monitor, because other things that should be white are white. if you look at the mask directly in channels, it is white as it should be. this doesn't seem to be causing any real issues, just an anomaly that I've never seen before.
Is more than one monitor involved?
Does turning off »Use Graphics Processor« in the Performance Preferences (Photoshop > Preferences > Performance > Graphic Processor Settings) and restarting Photoshop have any bearing on the issue?
Weird thing. He turned off the graphics processor, then restarted photoshop, and the mask turned a bright pink. He turned GP back on, and it was bright cyan. He tried it again and it's all good now.
I don't know what that means, or what caused it in the first place. Before I wrote my question, he tried with another version of photoshop that he had installed, and that was fine.
Thanks for taking the time to respond.
That seems to indicate the issue might be with the GPU driver.