[Dovecot] Problem with opening ports in alpha5 ?

If I leave the "listen" value as the default in /etc/dovecot.conf I'll get a message similar to the following on each port that it tries to open during startup:

# dovecot -F Fatal: listen(::, 143) failed: Address already in use

If I set either: listen = *

or listen = [::]

then it will start up fine. Perhaps it is as though the code tries to open the port twice for both ip4 and ip6?

- Bruce