Well, just to make sure, I did a fresh install of .8.2 on a different machine, and the GIF showed up fine. The other install was an upgrade from .8.1, so perhaps the problem was there. I've reinstalled and transferred the settings from the previous install and everything seems to be working fine now. In case you're still curious, the url for the problematic image was:
http://www.lib.chattanooga.gov/images/pastel.gif
Thank you,
Phillip
(BTW, I should probably mention that K-meleon is a great little browser)