I’m experiencing this memory leak on the current version of Unreal 4.9. I can barely use the editor for 10 min or less before my memory gets so full that I am forced to close Unreal. I can see the memory going up quickly while I have certain blueprints open. As soon as I close them, the memory stops going up but remains where it’s at. Open them again and the memory keeps rising until I get the message that I’m all out.