I'm running the latest daily Blender 2.80 on Windows 10 x64.
Steps to reproduce:
- Start Blender.
- The splash screen offers a couple of "recent projects".
- Select a project.
- The project opens in the last mode, which is the "Compositor". I was editing a movie clip previously there and had the backdrop enabled (before I saved the project).
- The backdrop is missing and does not appear automatically.
- Scrubbing the timeline would cause the backdrop to appear.
See attached screenshot where the backdrop is missing.