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Lately, every time I open an app, the very first window of it appears as a black box with tiny white/transparent corners and it’s becoming very annoying. Why is it happening and how can I fix it?

Here is a screenshot of what Outlook 2013 looks like:

enter image description here

I’m on El Capitan 10.11.3, on an early-2011 MacBook Pro.

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  • First port of call would be the MacBook Pro Repair Extension Program for Video Issues – Tetsujin Feb 3 '16 at 8:21
  • @Tetsujin Already done the hardware check and everything is OK. – Alex Feb 3 '16 at 9:21
  • You mean it's not eligible for that program, or that you ran the AHT? – Tetsujin Feb 3 '16 at 9:27
  • @Tetsujin That I went to an Apple Store and ran the AHT and it’s OK. – Alex Feb 3 '16 at 9:40
  • Are you running the OS X public beta? – nohillside Feb 3 '16 at 9:49

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