MShakeshaft wrote:Just a heads up, as I had exactly the same issue with v18. Look at all of your Video tracks in the edit page and make sure where it says V1 that it is not grey. If it is Click it to turn it back to normal and everything should work again. However after you close the project and reopen it, you will have to do the same again.
Hope this helps
Martin
This was exactly it for me and seems to be the underlying problem when I researched on other pages (despite them offering other solutions that would inherently do the same change in the end).
It's been happening a lot over the past two updates for me (18.5, 18.6) and it's easy to overlook the V1 track's activation on timelines with multiple video layers. Still not sure how it's turning off to begin with, since I almost never touch anything over there.