MPC HC changes in full screen mode

I finally got around to installing MPC and decided to mess around with Madvr to get optimal picture quality for my HD movies, but I've come across a problem no else seemed to have pointed out.

When I'm in window mode, it's perfect. But when I switch to Full screen (exclusive full screen) the brightness increases a tad bit messing up the colours. And the brightness level being setup all wrong is something that makes me want to walk out of cinemas, it honestly bothers me so much.

Could someone please tell me how to stop full screen mode from increasing the brightness

Thanks

Try the various options in:
madVR > rendering > general settings

Does the problem also occur if you use EVR-CP as video renderer, with "D3D fullscreen" option enabled?