I recently got an update (macOS High Sierra 10.13.5 Update), and it seems to have messed with the display a bit.
I use Octave (v4.2.2) to run experiments off of my laptop (MacBook Pro 13-inch, 2.3 GHz Intel Core i5), which requires me to put images on the screen (Psychtoolbox v3.0.14). Since I updated my computer the script errors out at the point where I attempt to put anything on the screen. Unfortunately, because of a bug with Octave, I can't see an error message, so I don't know the exact nature of the problem.
Apart for this problem with Octave, the screen randomly switches to "static" (like the old school TVs!). This only lasts for half a second before it switches back. But I can't help but wonder if both problems have a common root.
Any help is greatly appreciated! Mrinmayi