VLC Media Player Green Line
Solution 1:
Open vlc and then go to preferences > video > select in the output "X11 video output" (you can mess with this to find the one that works best for you).
That's it :P
Solution 2:
Ctrl-P/Preferences/Video/Output.
Choosing OpenGL GLX Video output (XKB) should solve this problem.
At the same time, that change should also improve appearance of subtitles.
Before:
After:
A good idea might be also:
Tools menu -> Preferences -> Video -> Uncheck "Accelerated Video Output (Overlay") (as stated here.)