If you have no connected/enabled recording devices in Windows you will not be able to see or hear other player's direct communications, text and voice. All other channels as far as I'm aware work fine for both text and voice.
I ran across this issue playing Altis life and DayZ(Arma 2 is affected as well) I would never hear or see direct comms, at first I thought people were just not talking in direct until I had a strong suspicion something was wrong on my end. I would imagine lots of people are affected by this bug but are oblivious there is a problem.