On my installation I have very few glitches at all. There is one, however, that is no more than interesting, it does not affect the operation of the aircraft. Each time I click an instrument, or turn a knob, the sound level changes at the same time without my having shifted viewpoint at all. Sometimes it is hushed but never mute, other times it comes through clearly. It seems to be some interference with the sound files, but is this mine alone or a known problem?

Ian, Hmm - strange one - from what I gather the sound is somehow being processed when it is played back ? That suggests you have some sound card special effects that are affecing the playback of the PMDG sounds. In Windows, goto your soundcard's option page - make sure you turn off all special effects like base boost / 3D effects / noise cancelling / ambience or any other effect as well. And, if you are only using stereo speakers, make sure "surround sound" mode is off on your soundcard. Hope that helps.

Thanks Armen: I no longer have a video card and just take the sound off my motherboard (an ASUS P6T). The nVidia driver has HD audio sound drivers as part of the whole installation, should I disable the Audio?