[plt-scheme] Slideshow v209

I'd like to run Slideshow, from DrScheme, on an OS X system that only 
has v209 installed.  When I run the program (one that works when loaded 
from Slideshow), the slides are made (according to the little dialog 
box), but the program stops without closing that dialog box.  It 
happens with one simple slide, or no slide at all (ie, by merely 
loading the module).

Am I doing something wrong?

rac