Ok, the sync problem seems to have gone away for the time being. First I uninstalled the 5.2.2 drivers DL’d the 5.3.1 set from the Decklink site but they would not install so I rebooted and reinstalled 5.2.2 again and now all of my files are in sync. Go figure.
Another seperate issue is why when I export a file from the timeline I get no audio in the resulting file. I have to export the A/V seperately to get both. I have poured over the settings ad nauseum and still no sound on export. Again, go figure.