display does not pan on mac os x

An image that exceeds the physical boundary of the screen cannot be
scrolled or panned on Leopard Mac OS X.  I recall this working before
on the Mac and it does work properly on linux.  The pan window
thumbnail view which has a black boundary to indicate the extant of
the monitor with respect to the image is maximized to the entire
image, even though the image is larger than the screen.


uname -a
Darwin Macintosh.local 9.7.0 Darwin Kernel Version 9.7.0: Tue Mar 31
22:52:17 PDT 2009; root:xnu-1228.12.14~1/RELEASE_I386 i386

display -version
Version: ImageMagick 6.5.2-4 2009-05-18 Q16 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2009 ImageMagick Studio LLC

Let me know if you need more information.

Thanks

Henry