Running Windows 7 Pro. Have Radeon HD7700. As of today I'm getting a solid red line down the center of all videos & gifs. I've uninstalled & reinstalled drivers 15.11 & 15.12 and no difference. When I use the generic Windows/Dell video driver the red line is not there.
Turn Off Demo On on Video Tab in AMD Radeon Settings which can be found on top right corner.
GREAT! That worked. Thank you VERY much.