You should post this problem in the answerhub man…
But yeah, you should run UE4 as an administrator! You should run almost every program as a Administrator.
Answerhub is really a lost cause for me… the questions I have posted there have been unanswered fro quite some time now…
That is why I posted this here after I posted it on the answerhub!
-do you package your game with shipping or development?
-which engine version do you use?
-run the engine with admin rights
-copy all your content into a new project and try it again