Hello, I am glad I found some one to talk to. I have a big Terrain scene and I am trying to use the Subtractive brush on a portion of that terrain and it shows up as an invisible red outline but it does not cut out of the terrain. I have noticed this issue on other boxes when I have a lot of things in my scene.
Just a side note, I am making a game at the moment that is very large. What an amazing engine:) I am excited for 4.1:)