Why do I get flickering icons in the viewport!? Mac OS X w/ Intel Iris Pro

Hi guys. I’ve got an annoying problem when running UE4 on my MacBook Pro with Intel Iris Pro GPU.
I don’t know how to explain it, so I post a screencast.

Any ideas?

OS: Mac OS X 10.11.4
16 GB 1600 MHz DDR3
Intel Core i7

Latest release build of UE4
Here: YouTube Screencast

same problem on macbook

same here - os 10.11.5, Mac book pro

hi, i just upgraded to 10.11.6, and got got this issue after the upgrade.