MBP Retina 2015: Graphical glitches after update to 10.12.4
You're not alone (see this thread: https://discussions.apple.com/thread/7908354?start=0&amp;tstart=0). I had the same artifacts and reverting to 10.12.3 "solved" everything. Let's hope this bug will be fixed with the release of MacOS 10.12.5 (sadly, I doubt it).