Looking into this a little more..
Does avahi have to be started before mt-daapd ?
/etc/init.d/mt-daapd
/etc/rc0.d/K20mt-daapd
/etc/rc1.d/K20mt-daapd
/etc/rc2.d/S20mt-daapd
/etc/rc3.d/S20mt-daapd
/etc/rc4.d/S20mt-daapd
/etc/rc5.d/S20mt-daapd
/etc/rc6.d/K20mt-daapd/etc/init.d/avahi-daemon
/etc/rc2.d/S50avahi-daemon