I have an animation with a moving camera which was working fine. I created a second camera for some still shots and set it in the scene tab, the stills have rendered ok.
Then I switched back to the moving camera to do some more work and the render is just black. Switching to either camera now produces a black image. I haven’t changed anything else.
I’ve been through the usual things that I forget, nothing is set to not render, the render layers are unchanged, my scene is unchanged.
Just as an update, I couldn’t find a single setting that was wrong.
I created a new camera which worked fine. I swapped back to the original camera and that also worked fine. So I have no idea how I’d messed things up, but simply creating a new camera solved the problem. I can only guess some handle or link had gone awry and creating a new camera synced things back together.