Hello. Well,something happened recently. I started screensaver(i have it on hot corner) and after some time my screen sleeps but not my hard drive. So i had it in that situation for some hours and when i turned it on i saw that everything was a little bit more blue. I log out my account and logged in again. Problem solved. This is a new MBP but it used to happen more recently on my old one(MBP too). Any ideas why this is happening?