This is probably the difference in encoding for the DD 5.1 SS Audio. It uses a fixed block size (1540 sticks in my feeble mind), while the Video will be to the frame Duration.
Depending on how you are Exporting the Audio files (from PrPro?), you can add a frame of either Black Video, or Transparent Video to make up that slight difference. Note also: one does not have to worry about "gaps" in Audio, though with Video they can cause problems.
I also strongly recommend including about 02 sec. of Black Video, with "silence" in the DD 5.1 SS Audio track, if going to DVD/BD, as it can take a full 01 sec. for some players to "lock onto" the Audio signal. All too often, editors will cram important parts of a musical passage into that first 01+ sec., and will loose it on many players. Note: higher-end players seem to have the most problem with getting the lock on DD 5.1 SS, while cheapo units seem to often do better.
Thank you for responding. That provides some helpful information about 5.1 audio that I was unaware of. I will be sure to take that advice.
I probably should have used the word 'preceeding' extra frame, since this is actually affecting the sync of the audio/video with each cooresponding clip.
Yes, I can see where that seemingly tiny difference could mess up sync.
Now, if you turn Snap OFF, and zoom in horizontally, it's pretty easy to adjust sync, just a bit time-consuming with a bunch of Clips.