I've had my WET11 hooked to my Audrey, a friends laptop, and a few other machines, both through a switch, all together, and individualy, directly connected. Both work just fine without changing any settings, except to change the WET11 to be x-over when connecting directly to a device.

You aren't setting it to be straight-through and then connecting it to a uplink port on your switch, are you?
_________________________
Donato
MkII/080000565
MkIIa/010101253
ricin.us