Just appeared for the first time this week, coinciding with Yosemite 10.10.1. (was not an issue with 10.10.0). This is on a MacBook Pro 15" Mid-2010 with Intel HD Graphics built in, and NVidia GeForce GT330M graphics in PCI.
First noticed a very blue cast in the menu bar, Finder windows (and any other white space on the screen), when using Photoshop, and intermittently when running Firefox or Safari. I had the same reaction - did something happen to the color profile of my display? When I launched System Settings (making it the front-most application and sending FIrefox and Photoshop to the background), the screen suddenly switched back to the normal color gamut.
Anyway, to make a long story short, the GPU seems to be my issue. In Energy Saver, I have a check-mark in the box for Automatic Graphics Switching. Un-checking it makes the screen go to the blue cast. I just ran Onyx to clear all the caches, but this did not solve the problem. After cleaning and rebooting, it was OK with Firefox, but it went blue when I launched Microsoft Outlook.
PS - This is not the first time for issues with this model of MacBook Pro. See Mavericks Finder window- and shadow-rendering issues-Screenshots - I had some serious issues with the first few revs of Mavericks that eventually want away. Apple even went through the expense of replacing my logicboard at no charge to me, even thought my Applecare had expired. So I can't say they didn't try. But I am convinced that this was a software issue, and so is the current problem.