Have you tried deleting the Media Cache?
I cleaned the cache and re-opened the project - no difference.
On all four of the clips I was working with the video was 5 frames early, so I ended up unlinking everything and shifting the audio 5 frames and exporting.
I also noticed I am not seeing the closed caption display. I am going to uninstall/reinstall CC.
The manual un-install/re-install worked. Opened the same project, clips were in sync and the closed captions were displaying.
Now I am getting a stuttering in the timeline preview when the closed caption display is enabled and the area has no captions. Uggggggg.
I cleaned the cache
That may not work. In the future, go in manually and delete the files using Explorer or Finder.