Just now, it was actually fading out and then back in again, very quickly where there were absolutely no transitions at all. I made no changes to the clips in that section and then I rendered the whole project and it rendered it correctly in the final video! Later on, it reverted to rendering the correct thing for this section. In the meantime I had not edited this section or anything near it at all.
It seems to be failing to refresh a cache or something. Eventually, if I change the preview range and switch between 'Instant Play' and not, I can eventually get it to render the right thing. This has happened several times today on different parts of the video. It doesn't render something out of thin air, it renders something that I had previously changed and doesn't update it's knoweldge of actually what is there right now.
I guess other people would have experienced this at some time? I searched for some sort of a button to 'clear the cache' but couldn't find one. I suppose I could go into the chosen directory and delete them all, but I fear this is a bit underhanded.
