Thanks for the pointer Rob, however I just did a little more testing.

My config is :

Tivo+PC+Dell Receiver > netgear FS105 switch > WET11 -v- RG-100 AP > netgear DS108 hub >> Win DHCP server + Music Server.

With a laptop attached to the FS105, it works just fine, picking up a DHCP address.

If I pull the cable from my ethernet converter to the Dell Receiver while its playing music, and connect it to the switch, there is a pause, but it eventually continues playing music.

I can even select other songs in the menu and play them. So the problem initially appears just to be that it cannot get a DHCP address.

However after a while the player then reboots, and I find the bridge (WET11) will not pass anything. Requires a reboot of my AP etc.

When you boot the Dell ( pluged into switch ), you get the Dell logo, and then the next logo - Audio Receiver, and then it either eventually comes up with unable to find server ( showing a 169.x.x.x type address ), or it keeps rebooting itself.