I have the newest version of Unreal Engine, and I am getting the same problem every time. Whenever I drag an object into a game, the outline showing the Y Axis and X Axis shows up, but the actual object doesn’t. Also, the outline keeps flickering. I’m not sure if this is my mac being slow, but it’s a huge problem, because I can’t really blueprint it, and I’m not able to see it at all.
Two things to possibly check; Could your normals be inverted? Standard materials are onesided and therefore won’t show backfaces. Secondly; Does the object have a material? Sounds odd but i’ve had materials dissapear on me, which creates the effect you’re describing.