I've been playing around with this tool for a day, and I really like its potential. But I'm having a really hard time getting the shapes I draw to turn into surfaces to use with the Joint Push Pull tool. For example, I extrude a simple cylinder (using built-in tools), and then draw a rect, a circle and a hexagon on the side using ToS. Sometimes it creates a face that I can use with JPP, sometimes it doesn't, and I can't figure out why. Any clues?