[racket] mac plot crash

Hi,

I have a module that begins with (require 2htdp/image) and (require
(prefix-in plot: plot)).  When I require the module on a Mac, I get:

ffi-lib: couldn't open "Volumes/Racket v5.0.1/Racket
v5.0.1/collects/plot/compiled/native/i386-macosx/libfit.dylib"
(dlopen(/Volumes/Racket v5.0.1/Racket
v5.0.1/collects/plot/compiled/native/i386-macosx/libfit.dylib, 10): no
suitable image found.  Did find:

        /Volumes/Racket v5.0.1/Racket
v5.0.1/collects/plot/compiled/native/i386-macosx/libfit.dylib: unknown
required load command 0x80000022)

Any thoughts?  I am new to Macs, so apologies in advance if the fix is
simple/obvious.

Thanks,
RM
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