Black bars/lines appearing on desktop/mission control?

Discussion in 'macOS' started by Peckman, Jan 9, 2013.

  1. Peckman macrumors newbie

    Joined:
    Jan 27, 2012
    Location:
    Montreal, Quebec, Canada
    #1
    Hey everyone,

    For the past few weeks I've experienced a situation where sometimes when I open mission control or view the desktop there's horizontal black bars/rectangles that appear on the screen. They only disappear if I log out/back in, or restart the computer. Has anyone experienced this before or have any idea what the cause is?

    I'm running OS X 10.7.5 on a Late 2011 MacBook Pro

    [​IMG]

    As you can see there are black bars going all across the "grey" mission control area, with a few black square boxes as well.
     
  2. Peckman thread starter macrumors newbie

    Joined:
    Jan 27, 2012
    Location:
    Montreal, Quebec, Canada

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