I've read in an answer here that in order to suspend-resume a scene correctly you need an overlay scene.
In my case I have a main scene and an overlay scene. I use the overlay scene to pause-unpause the main scene.
Now I wish to change from the main scene to other secondary scenes and back(resume). So I send a message to my overlay_scene_camera_obj to suspend the main scene and set a new scene(secondary scene). My problem is that when I want to go back, I send again a message from an object in my secondary scene to my overlay_scene_camera_obj but nothing happens.
At first I thought I would need to add the "overlay" scene to the secondary scene too, but it did not work. But still I suspect the "overlay" scene goes off during the change from my main(+overlay) to secondary, so any messages sent to overlay from secondary don't get through.
So is there a useful documentation/thread or can someone tell me what I might be missing.
p.s. I thought someone had posted here or in blenderartists couple of years back regarding this actuator and its "problems". But I couldn't find the thread.