AMD Athlon(tm) II X4 630 Processor × 4
Gallium 0.4 on AMD RS780 (DRM 2.43.0 / 4.4.0-83-generic, LLVM 3.8.0)
Broken: 2.78c e92f2352830
Short description of error
Exact steps for others to reproduce the error
create an empty scene and put ate compositor
create in the blender file multiple scenes, each scene with diferente group characters and group props linked after the creation of the composite scene.
if you put the scenes on the sequencer at the first scene (named composite for example) you will see nothing on sequencer view, should be able to see even if you create first, but it only works if you create the composite scene later. so you can not link anything new without deleting and creating a new composite scene.