Just downloaded the new 1.8.3 beta - testing out the improved boolean geometry. I created several complex stroke overlays and then selected all and expanded - all went well with that. When I hit divide, the top negative space filled in. I went back and tried again with the same result. I know the divide boolean is still being worked on - just trying to do my part to help get it where it needs to be. thanks!
divide causes fill.afdesign