It seems that `racket/gui' is trying to freeze and thaw window updates before the canvas is mapped. The relevant Gdk window changes when the canvas is mapped, which means that Gdk and `racket/gui' end up with different opinions on the freeze/thaw state of the canvas.
I've pushed a repair to fix freeze/thaw requests based on the canvas's mapped state, which hopefully fixes the problem that you're seeing. _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
