This is now the second time this has happened, so I am posting here to see if anyone knows why. For no reason that I can think of, I pressed play in the Unity Editor and all the objects in my scene simply disappeared - the objects that would normally show up in the Hierarchy tab. No camera or anything. No, I did not add them when running, they have been in the scene for months. This exact same issue happened to me a few months ago.
Anyone have any idea why this is happening or if it possible to get them back?