Takkng the installation that I had trouble getting to be recognized during an upgrade when testing Fedora, it recognized the released FC4 disks. The installer recognized that I had rawhide installed. Mail was from 3/16/2005 to give a timeframe. Giving that the releases seem to be recognize by the fedora-release package, maybe the fedora-release package is corrupted in some way. If you download the fedora-release package and replacefiles replacepkg the rpm. it might uncorrupt some files.
It does not appear to be related to LVM directly, if at all.
Jim