I just experienced the same problem. I noticed the owner of my /media/IPOD was set to 'root' (and not to my username as usual) and I couldn't use the command 'sudo chown -R [username] /media/IPOD
' to re-assign permissions:
chown: changing ownership of `/media/IPOD': Operation not permitted
So, I simply ejected the iPod through the GNOME file explorer, and re-attached the iPod, and strangely the iPod files owner were shown to be my username again.