Hi Keith,
I assume u clicked ur way through debian.org looking for a CD-Image to download, so I think ur using Debian 'stable' codename Lenny. You have come to us at the time of harvest :) The new Debian, now 'testing', codename Squeeze is nearly finished, I recommend u download a testing installer and try from there as you will probably want to update to the latest version in a month or so if u dont.
Here's the package you should file a bug against:
http://packages.debian.org/lenny/debian-installer
Here's a link to the installers I spoke of:
http://www.debian.org/devel/debian-installer/
http://www.debian.org/releases/testing/
It may seem a bit hard to find out what image you need, but from there on u shouldnt see a difference...
Its essentiell u confirm that the bug is reproducible. Try with another CD/etc and confirm the MD5-checksum of your downloaded image is the same as stated on the download page. Always waste your own time first...
bye
Simon