Well using the avahi patch works fine. Switching to howl gives me the following:
Starting rendezvous services
Starting polling thread
Entering runloop
Waiting for data
Registering rendezvous names
Received a message from daap server
Registering _daap._tcp.XXX’s Music (3689)
Received a message from daap server
Registering _http._tcp.XXX’s Music (3689)
Publish reply: stopped
Publish reply: name collision
^C
Stopping rendezvous daemon
Received a message from daap server
Stopping mDNS
Received a message from daap server
Rendezvous socket closed (daap server crashed?) Aborting.
Aborting
Not sure if this helps. It looks like for some reason it trys to register the name twice.