Conflicts may arise between 2htdp packages and racket/gui. If you still want to stick to 2htdp awesome libraries you may try to require only what you need. But this would force you to use racket/base instead of *SL, if only because you also need to use `require` options not available in *SL as well as `define-values` to retrieve what `get-display-size` produces. Maybe something like this:
#lang racket/base (require 2htdp/image) (require 2htdp/universe) (require lang/posn) ; also needed if you are going to use place-images (require (only-in racket/gui/base get-display-size)) -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.