I don't know if this is a problem specific to my treo 680 or what...

I'm trying to use the Nokia HS-12W bluetooth headset with the treo 680. Whereas it worked flawlessly with the treo 650, it didn't work with the 680. When I make a call, I can't hear anything from it, yet the other end would hear me!... it's like only sending, but not receiving.

Anyone know a way to resolve this?