Oh 
I see I just tried to do File->Package project with my simple test setup and indeed I just get a black screen. It worked in Play->Standalone.
Would any engine dev’s be able to chip in and and tell us a bit more please?
Is there a way to get this working somehow ourselves? Can this be made to work in the near future? It seems like a bunch of people are wanting to have this functionality!
(is there a list of things that work in the editor but will not work in a full build? It should probably be removed from the wiki if it is not working.)
Cheers