FC4 bluetooth pairing problems, phone <-> laptop? (OK in FC3)

[Des Johnston]

I am unable to persuade a Nokia 6630 phone to pair with an Armadillo 
Bluetooth CF card (LSE039) in an IBM x21 laptop (FC4 clean install). The 
laptop and phone can see each other but refuse to pair. When initiating a
pairing it doesn't get as far as requesting the pin on the laptop.
Changing /usr/bin/bluepin to echo a particular pin has no effect.

The same setup (with identical bluetooth conf files) works fine in FC3,
requesting a PIN when pairing and hooking up thereafter to give gprs
over /dev/rfcomm*

Another minor hassle is that a DBT120 bluetooth USB dongle won't 
initialize on a desktop machine, which again works fine in FC3.

Has anyone run across similar difficulties (and solved them .. :) ?