I have a problem with my new 15inch 2011 macbook pro playing vlc videos. At the top of all my mkv files I get a weird distorted set on lines. These lines do not appear on my 2010 macbook air, and it is running the same version of vlc. I have downgraded the versions and that does not help. The files will play in quicktime with out the lines, however, I am sure that the sound and picture suffer in quicktime. I have tried about 15 of my files all the same problem I even download a new one just to be sure....same problem So my question is can anyone help me before I have to return it?