I am running a home media server with Ubuntu 10.04 server edition. I connect my laptop (running 10.04 desktop) via sshfs.
Today, applications such as Rhythmbox, VLC have been unable to read the files. I can view them in Nautilus, and the permissions appear to be unchanged.
The problem appears intermittent - mp3s will play for a few seconds, then stop and produce an error message.