I found interesting problem when using Youtube with the new Edge browser of Windows 10. There is two black horizontal lines probably 1 px height.
Screenshot of a random video: click here
It's happening only on YouTube (but this is one of the most used websites from me) and there is no burned pixels on display.
If you have any idea, I will appreciate it.
I've seen the same lines, but they disappear after a second and they don't appear every time I open a video. They seem to be linked to the video start-up or the ad engine: in the new YouTube design, all the controls (e.g. volume, settings and screen size) are only visible for a second or so, together with some icons in the upper right corner.
I have no real explanation other than the above, and I haven't felt it was a problem. I haven't seen the lines on IE11 or Chrome (yet).