I have Pro12.0 which has worked well up to now where I started with and audio file then added pictures plus an sound and picture video. When I go to render it only opens rendering for audio. In addition I was having a problem when editing in that at some point during editing the audio output went to mute. I had to close an open Pro to get the sound back. I reinstalled 12.0 and still have no sound output, and rendering shows mpeg in the available list, but won't permit me to render (the button won't light up). When I close render and reopen, it labels the file .wav and will only permit rendering as an audio file. I opened for a new project, put in a video, and rendering still only for .wav.