I seem to be missing pretty much all interior cockpit ambient sounds (with buses powered) on the ground.  I can hear switch sounds, warning sounds, external power cart, etc.  I thought nothing of it, until I suddenly heard them while recycling views quick.  Then, just as quick as they appeared, they disappeared again.  Not sure exactly how to reproduce other than cycling my exterior/interior views back and forth quickly on ChasePlane.

Seems I'm having the exact same issue, however I have yet to be able to make the sounds appear at all. Strange. 

There is an issue where cycling between views will cause the audio to... not function as intended.