I have the same problem, with 2.9.
No white dot / can't see the white dot in VR. Can't click the antenna symbol, so stuck in the common room.
Also (in VR) DCS hangs when trying the "Start Microphone Test" on the Options screen.
Just found out I can see the white dot when in an external view and click on the VOIP menu. Then go back to cockpit view.