I started seeing a very thin (1 or 2 pixels) vertical red line directly in the center of the Flash Player window several weeks ago and I have been unable to fix it. It does not appear when I am watching videos in VLC Media Player, and it does not occur in all Flash Player videos, but it does appear in most of them. I rolled my driver back from 16.300.2311.0 to 16.150.2401.1002 and it is still occurring, I'm using the Radeon Crimson software, AMD Radeon R7 Graphics, on Windows 10 with a CPU Type AMD A10-7850K Radeon R7. Can someone please provide me with the steps to get rid of this vertical line? Thanks very much.