Here is an example - all reflective materials (glass, metal, etc.) does this in my scenes and IDK what to do about it. Tried looking it up, havent been able to find anything.
What’s your reflections mode in your PPV? Are you in forward or deffered shading? Are you familiar with the basics of real-time rendering? Is this viewport or MRQ?
UE’s been seeing a surge of people from the offline world into a real-time system, so those are just a few of the basic questions to diagnose problems, as they are.