Well, I thought I would be much farther along by now! I have Indigo disconnected from my network. ISY is installed and seems stable. My PLM shows up as connected. When I check the system status, though, I get "null" and "zero" for everything. Active: No, Total: 0 MB, Reserve: 0 MB, etc. When I click "Start Linking" and press the SET button on some switches, nothing shows up in ISY. It does not seem to see any devices that can be added, although I can see the SET lights on the switches blinking across the room. I've used this PLM before with ISY and it worked fine.
I'm sure I'm doing something really stupid (or, more likely, not doing something obvious). Any suggestions would be most welcome. I have restarted ISY, rebooted my Mac, etc. I'm totally perplexed at this point.