Z-fighting glitch in editor?

i started up unreal engine 4 today and went in to one of my project files and this started to happen:

Hi ,

This is a known error of graphic artifacts in the editor on Macs using Certain AMD graphic cards and has been reported fixed for a future release of the Engine. [UE-21214]. If you are not on a Mac and/or not using an AMD graphics card, please let us know so we can continue testing to make sure this is resolved on all platforms and for all relevant hardware.

Thanks for your contribution in improving the editor.