Hi Bob, good to hear from you!. How are you keeping?.
It is weird... I uninstalled and reinstalled GSX2. Nothing. Change the playback device and it worked. Back to the default device... problem is back. Started FSLabs, played around with the intercom and volume control, it worked. Restarted P3D with another aircraft and it is all back to normal.
My suspicion is that there is something with the volume control on the FSLabs aircraft... It's happened before and somehow got resolved but always FSLabs seems to the last known aircraft before it all went wrong... And don't get me wrong, I love FSLabs...
Take care, my friend.
Christian C.