Hi. I did make new level with copy actors and everything from some game level. I thought it will useful for place new actors and quests and dialogs without adding code to blueprints. So, after I create duplicate (on " Levels " window is option create new level with highlighted items), the parent level (really he not called as parent) lost all lights… Only darkness on level. Look like some bug in UE 4.27. Too bad, I saw it too late and make some corrupted file savings… I will try, is any idea turn lights on? Add again? But they were on level already.