I have a graphical error in UE4 4.11 for mac. How I can solve this issue?

The icons of the actor, the pivot and the volume´s edges start flashing. They start with out aparently cause. I just created my project in UE4 4.11 and since the first instant the bug begun. I tried to uninstall and install the UE4 4.11 , but doesn’t work. So if you can help me. I’ll glad with you

I think this a problem of the operative system, because since I update my Mac, other issues in old versions started.
Also the 4.11 prewiew worked fine in my MacBook.