We're trying to debug an Avahi/cups configuration around here: We have an Ubuntu Server 10.04.3 running cups 0.6.30-0ubuntu2 with printer sharing enabled.
Cups on our Ubuntu 11.04 machines running cups 1.4.6-5ubuntu1.4 and avahi-daemon 0.6.30-0ubuntu2 somehow isn't able to detect the printers published by this server.
Interestingly I'm able to see the published printers on my machine running Ubuntu 11.10 with cups 1.5.0-8ubuntu5 and avahi-daemon 0.6.30-4ubuntu1, my colleague running the same configuration however is not able to see these printers in cups.
The weird thing is that we're able to see the server in avahi-discover on all machines. Interestingly it was working for the last few months...