I tried using Photoshop CC and got a warning that there is a problem with my color profile. I ignored it and tried to start using PS. When I created a new image with white background the white wasn’t white at all. It took me hours to find out that I can’t solve this problem in Photoshop because I have to solve it in Windows.
I had to open extended color managemet and add a new default profile “sRGB IEC61966-2.1”. After a restart of PS my white was good enough again =)