When I link in a scene that has animation in it, and set that scene as the background, the animation doesn't playback if I'm using the new depsgraph. This works fine w/out the new depsgraph.
launch blender with --enable-new-depsgraph flag
Create file1 with a scene called "layout". Animate a camera in the scene.
In file2, link file1/Scene/layout.
In the scene property panel set the scene background to be "layout"
Scrub in the timeline - notice the camera doesn't update.
If you launch blender w/out the enable-new-depsgraph flag, it works fine.