Lately I've noticed that certain audio will not render with a project. Usually the audio file will playback on the timeline but once rendered the audio will be missing.
Observations: This happens when I have many tracks with layered audio & the missing file is only with short files (less than 5secs)
I've tried copying the audio file to different harddrives but that doesn't seem to help. Again, it plays back on the timeline great -- but it's just not rendering.