I have this running on an Intel Mac Mini on 10.4.11. When I started it, it could not find any devices to monitor and brought me to the preferences window. I tend to be the type who reads the manual only if I can't get the software to work. In this case, no need. I clicked on 'scan', I think, and it found my Ethernet adapter. I clicked on capture and it did a fine job of displaying my traffic. It's just a tad annoying to enter my root password every time I ask for a trace, but I can live with that.

The program identified a lot of udp, broadcast, and arp commands coming from my Verizon DSL modem. Apparently, Verizon likes to keep tabs on all devices connected to their network at an interval of less than 1 second. I thought I had a virus. Well, kind of.