Hey peeps.
Well i got updated to 1903 and immediatly ran into a problem with opengl games like Doom3.
Setting gamma in game or modifying color profiles in windows no longer worked, and things looked a bit strange compared to the previous version.
Took me a while to hunt down what caused this and it turns out 1903 makes some assumptions that are plainly wrong with some monitors.
Go into device manager find your screen and change it to pnp screen (standard) and things will work again.
Hope this helps anyone else with this problem.