I know I don't need to remind you this, Tom, but have you ruled out the physical/hardware stuff first? Remember how the empeg sometimes doesn't like certain routers or hubs, well the Receiver has the same problem. Rule that out first if you haven't already.

And by the way, the Receiver doesn't "run stock software", it doesn't run any software at all. It's got just enough in its boot prom to get DHCP and connect to the NFS file share to download the software from the server each time it gets electricity applied to it. Perhaps you already knew that, too, and I'm just exercising my fingers...