In the upstream gnome bug report, TJ commented:
> The cause seems to be a user profile that has been upgraded from an older
> distro release, where the contents of /var/log/ haven't been inherited. It can
> also happen where multiple release installations share a common /home/$USER/.
However, I see this behavior with an entirely fresh install of jaunty into a test vm, where the user was entirely created from scratch.
'gconftool-2 -g /apps/gnome-system-log/logfiles' reports:
which also misses useful stuff like the wpa_supplicant log.