Report Layout designed in a composite actor window is lost
When you have a workflow with a composite actor, and you open the composite actor, its contents appear in a new kepler window. If you design a report layout in this window, and then close it, the parent workflow report designer does not show this layout. If you open the composite again, the report layout is not there either.
If you leave the composite actor window open with a report layout, no instance is generated for it after execution.
I'm not sure if or what the plan was for this scenario. Maybe switching to the Report Designer view should simply not be allowed when you're in a composite window. I think this would be a good first pass. An alternative is to keep the 2 (or N) report layout guis and objects for parent window and all opened composite actor windows in sync, and this will likely be more work.