My jailbroken iPhone 3gs runs iOS 4.3.3 and I have downloaded miwi and tethered my Wifi Xoom through bluetooth. That works fine.
After install the 3.2 update, tethering works flawlessly at first time, but upon disconnection. The iPhone just says "not connected" and the Xoom try to connect and then unconnect. Try having upaired both devices, still not working.
My friend also have this exact same issue. Now I have to reboot my Xoom every time to re-tether.