I was suspicious that merging the audio and video files (whose bit rates did not match) may have been the culprit. So, I batch converted all of the .WAV audio from my Tascam DR-05, to bit rate matched .AIF files. With these new audio files, I remerged the audio and video files. Thus far, the crashing has gone away.
Hope this helps the many others facing this Mac PP CS6 crashing issue.
DJ