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))

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