The brightness of the whole screen seems to change (quite drastically) depending on the color at the center of the screen.
The result is that either the inside cockpit is visible but the outside is too bright, or the outside is good but the cockpit is too dark.
I use opentrack and the transition between the two conditions is frequent and really slow.
Moreover, using headtracking I don't always look at the center of the display, and if by chance the darker canopy bow is in middle screen, I cannot see outside.
I'm not sure this is DCS, but I tried to solve all Windows issues before, with no result.