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What is this blue triangle in the top left corner?

D

davidc81

macrumors newbie
Original poster
I'm getting a blue triangle in the top left corner of my screen sometimes. What is it?
 

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  • Screen Shot 2013-12-18 at 12.39.16 AM.png
    Screen Shot 2013-12-18 at 12.39.16 AM.png
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