Thanks. I started to think that was what was going on after I sent the mail. Doh! Thanks for the explanation. <blockquote type="cite">On Jun 8, 2010 3:09 PM, "Carl Eastlund" <<a href="mailto:cce@racket-lang.org">cce@racket-lang.org</a>> wrote: On Tue, Jun 8, 2010 at 2:47 PM, Curtis Dutton <<a href="mailto:curtdutt@gmail.com">curtdutt@gmail.com</a>> wrote: > Just found a quick littl...This is not a bug in format, but rather a peculiarity of the "print" function and different kinds of output ports. Try the following in DrRacket: (print (+ 11 (/ 5 16))) (newline) (with-output-to-string (lambda () (print (+ 11 (/ 5 16))))) The fraction displayed as 5 over 16 with a line between is not, in fact, a string, but is instead an image. DrRacket uses a special output port that can display graphical images; but format and with-output-to-string use a port that can only accept characters. The print function distinguishes between these kinds of ports and decides how to render fractions accordingly. --Carl </blockquote>