I am having the same problem. I already contacted NCH about this and it seems they only experienced the problem in Vista (I'm using XP and having the problem). They also said they are waiting for the manufacturer (Yealink) to release a new Vista Compatible driver for the USB phone, perhaps it will solve the problem. If not, and it is indeed true that the phones changed in 2007, this may explain the problem (as mine are new as well).