The Mac core GUI and graphics libraries are slightly different on laptops with the touch bar, in ways that broke Racket's GUI libraries. You can see the commit

The Mac core GUI and graphics libraries are slightly different on laptops with the touch bar, in ways that broke Racket's GUI libraries. You can see the commit that fixed it here: https://github.com/racket/gui/commit/b9e94f9c45e070beca79b286c6c47a325b38dbdb https://github.com/racket/gui/commit/b9e94f9c45e070beca79b28...