I have done a search but couldn't find anything relating to this particular problem - apologies if it has been covered before.

I am using VV4. Before I sarted adding some stills above the video track the audio was in sync. Then I added a few stills with some track motion on each so that they overlay the video and move about a bit. Now when I play from the time line the audioo is slightly put of sync.

I notice that on some sections if I pre-render the audio seems to be in sync until that pre-rendered section runs out. But thgis doesn't happen for all pre-rendered sections.

Any idas, please?