Paul will know better, but I think it has something to do with the layers? There is a setting somewhere, just have to enable it? Or is it masking out parts? Dangs I have to scout some of the videos for a refresher, but probably Paul will answer before it. I’ll still search some of the videos, I’m curious to see the answer. It’s these courses by the way:
https://cgcookie.com/courses/grease-pencil-basics-an-introduction-to-blender-s-grease-pencil
https://cgcookie.com/courses/panels-create-a-comic-book-with-grease-pencil-in-blender
