This bug has been opened here: http://bugzilla.ubuntu.com/show_bug.cgi?id=21686

"Using dapper's gnome-panel (2.13.3-0ubuntu3) I have an entry in my panel called
"patches on (null)", my .gtk-bookmarks is as follows:

---
file:///home/crispin/Download
file:///home/crispin/patches
file:///space/crispin
file:///tmp System temp dir
file:///media/cdrom1/preseed
x-nautilus-desktop:
---

I'll attach a screenshot of the problem menu. The interesting thing about the
patches directory is that it is a symlink:

$ ls -l /home/crispin | grep patches
lrwxrwxrwx  1 crispin crispin     42 2004-10-24 16:11 patches ->
WebSites/patches.theflowerday

and that /home is nfs mounted off a different server:

$ mount | grep /home
server:/home on /home type nfs (rw,rsize=8192,wsize=8192,addr=192.168.0.1)

http://bugzilla.ubuntu.com/attachment.cgi?id=5505
Screenshot
...
I have an entry named "(null) on kaos".

Contents of .gtk-bookmarks:

sftp://cs@kaos/home/cs

The host kaos is not present in /etc/hosts but comes from a breezy installation."