Rainbow colours distort my screen after closing a certain game
I remember one time where I still had f.lux on my Computer and I was playing a game called Second Life. After about 30 minutes of playing that game, I closed it out. A few seconds afterwards, my screen turned into... this.
I'm not joking; this actually happened and I swear this was for real. Uninstalling f.lux seemed to solve the issue, and I'm afraid to install it again until they fix this.
and you were using the suitable settings for flux?