Don’t quote me on this, but I think mt-daapd 0.2.4 is the most recent version of the daap daemon and protocol.
Well if you installed a nighlty build, you can update nightly builds of firefly by first doing:
first backup config file and playlists (ie. mt-daap.conf)
If using Unslung:
cd /tmp
wget http://nightlies.mt-daapd.org/dl.php?FILE=mt-daapd_svn-xxxx-1_armeb.ipk
ipkg install -force-overwrite mt-daapd_svn-xxxx-1_armeb.ipk
recopy config and playlists
the temp downloaded files will be purged on reboot. Note: check the nighlty builds list at the firefly download page and replace xxxx with the build you want.