I just got a new PowerBook, running Mac OS X 10.4.2. At home I have an iMac running OS X 10.3.9. Both are Bluetooth enabled. I can send files to my PowerBook from my iMac, but I can't go in the other direction: it says 'unable to validate device.' In both cases, the devices are on the 'favorites' list, and it looks like the settings are OK. Any idea what's going on?