I have an issue when entering fullscreen mode in any application on my MacBook Pro with OS X 10.7.3, a white horizontal line always appears at the top of the screen (as shown in the picture).

What is causing that? I've never had it before and I can't figure out what I've done to cause it. Anyone that got the same issue or know what's causing this?

  • I had this problem as well and it was Kaspersky for me, too. I force quit everything one by one to figure it out.
    – Dave
    Commented May 17, 2015 at 1:18

1 Answer 1


Do you have and programs running such as VMware or Virtual Box installed and running in Full Screen Mode in the background? It alsmost looks like a VM or remote desktop toolbar. Have any programs running that have tool bars such as pictured below.


  • Ah! Thank you. Just remembered I recently installed Kaspersky Antivirus 2011 for Mac. I restarted the Kaspersky software and now the line is gone! Thanks! The funniest is that Kaspersky AV doesn't even have toolbar there...
    – Bazze
    Commented Apr 19, 2012 at 18:23
  • I had an odd feeling that's what it was, I just couldn't put my finger on it...
    – daviesgeek
    Commented Apr 19, 2012 at 18:32

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .