im not entirely sure, but could it be possible that madVR sometimes produces a very thin line at the top of the picture, right below the black bars? (e.g. with AR 2.35)? had this minor kind of irritation as can be seen on the US BD of minority report which was not present with EVR any more.
madVR017 left, EVR, right
not exactly same frame, but doesnt need to be, as it is present throughout the whole scene.