Scenes missing from list.

I've just installed 4.0 RC. On opening a file created in 4.0 Beta, the game loads but if I go to scenes several of the scenes are missing.

I can still find them referenced in 'texts' and via Tools / Explorer
But I can't browse to them elsewhere.

If I run the game, it still runs as is normally, the content is all still there, it's just not showing up in the editor.

Any idea on what may be happening and how to get them back?

I have just discovered that the evaluation version of RC limits you to being able to edit only 10 scenes, explaining why so many of them are missing.

Good news is I already bought a license, just waiting for the confirmation and key to come in once the weekend is over.