During playback, the top strip of the video is constantly flashing. It eventually devolves into what you can see in the first screenshot. This video plays back fine in every other video player, including older firefox. If this is allowed to continue, other parts of the OS start and other applications start to become affected - text gets stretched out, colors become wrong, etc. I've seen the Power Button/Settings part of my Start Menu become blobs that stretched across my screen. I'd attach more screenshots but I havn't been thinking to take them.