Bonjour broken

For some time I've had no problems with Bonjour. My Mac is called 'G4', and I can usually browse my own web sites by visiting g4.local. However, it's all recently stopped working. I can access my other machines - MacBook and iMac - via this mechanism, but this machine is just not playing ball any more. If I use Bonjour Browser, I can see that it has been given the name 'Macintosh-000000000000' instead of 'G4'. Weirdly, bonjour browser doesn't see my other machines, but I can access them with their bonjour names without trouble. Restarting file sharing or changing the name made no difference. I can still access the sites using local network addresses, but this bit of name resolution seems broken. I've also tried flushing lookupd, but that didn't help either. There's nothing relevant in my console output that I can see, other than some comments about there already being a sync server running, but I don't know that that's anything to do with this problem. /etc/hostconfig hostname is set to -AUTOMATIC-
Any ideas how to track this down?

Sounds like a corrupt file... or worse, but I'd try a new User as an experiment to help determine where/what it might be.
If I were to guess a file right now, I'd say...
/Library/Preferences/com.apple.sharing.firewall.plist

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