[racket-dev] bitmap error and drracket hangs

> $ drracket board2.rkt global-constants.rkt graphics.rkt &
> make-bitmap: expects type <exact-positive-integer> as 1st argument, given: 19.0; other arguments were: 19.0 #t
> 
>  === context ===
> /Users/matthias/plt/collects/racket/draw/private/bitmap.rkt:785:0: make-bitmap
> /Users/matthias/plt/collects/mrlib/image-core.rkt:319:4: draw method in image%
> /Users/matthias/plt/collects/mred/private/wxme/text.rkt:5203:24: sloop
> /Users/matthias/plt/collects/mred/private/wxme/text.rkt:5172:16: lloop
> /Users/matthias/plt/collects/mred/private/wxme/text.rkt:4969:2: refresh method in text%
> /Users/matthias/plt/collects/mred/private/wxme/editor-canvas.rkt:587:2: redraw method in editor-canvas%
> /Users/matthias/plt/collects/mred/private/wxme/editor-canvas.rkt:494:2: on-paint method in editor-canvas%
> /Users/matthias/plt/collects/racket/private/more-scheme.rkt:149:2: call-with-break-parameterization
> /Users/matthias/plt/collects/racket/private/more-scheme.rkt:265:2: call-with-exception-handler
> /Users/matthias/plt/collects/mred/private/wxme/editor-canvas.rkt:1165:2: do-needs-update method in canvas-editor-admin%
> /Users/matthias/plt/collects/mred/private/wxme/text.rkt:748:2: end-edit-sequence method in text%
> /Users/matthias/plt/collects/framework/private/text.rkt:2183:4: do-insertion method in ...ork/private/text.rkt:1867:2
> /Users/matthias/plt/collects/framework/private/text.rkt:2177:9
> /Users/matthias/plt/collects/mred/private/wx/common/queue.rkt:374:7
> /Users/matthias/plt/collects/mred/private/wx/common/queue.rkt:409:32
> /Users/matthias/plt/collects/mred/private/wx/common/queue.rkt:524:3$ 

I start up drracket, run a program, and get a pop-up error message that says something like the above, and then drracket hangs. I have to force-quite it. 

This program ran w/o problem in this morning's edition of drracket. 

;; --- 

Built from scratch ~20 mins ago -- Matthias