Howdy Batigol,
Thank you for posting this issue. I am going to need a bit more information from you before i being digging into this issue. Would you be able to provide a full build log to this post? Also, Have you tested this issue on a newer version of UE4? There have been many Mac improvements since then. Also, Could you attached the specs of your Mac to see what you are currently running?
Any additional information would be greatly appreciated.
Thanks and have a great day!