It appears you don't need to do anything for the multiple discs to appears on collections.
Looking at my Aliens Collection the discs can be seen. However the discs cover over the top of the collection logo image which isn't great. You can just see a white part of the logo behind the last disc in this screen shot.
However the multiple discs are not appearing for some reason on every collection, if I look at the Freddy collection there are no discs showing. Yet some of those movies do have disc art but not all of them. So I am wondering if the multiple discs will only appear if you have every disc art image for each movie title in that set?
EDIT:
Although having just said that, this "Alone in the Dark" set, I only have one disc art image for the first movie, there is currently no disc art image present for the second movie. Yet one disc is being displayed in the screen shot below.
One difference with this particular "Alone in the Dark" set, is I must have missed it out and as yet have not created any "Movie Set Artwork" images for it. So I will do that now and run the automator again and see if the disc is still displayed then? .............Yes the single disc is still displayed after creating the "Movie Set Artwork" images for this "Alone in the Dark" set and re-running the automator.
In that case I don't know why the Nightmare on Elm street set isn't showing any discs as there are some disc art images for it present on the file server.
Solved - Something funky going on with the first "A Nightmare on Elm Street" movie title, if I run Artwork downloader on it in Solo mode no disc was downloaded. I then ran Artwork Downloader again in GUI mode and picked a disc art, now the other multiple discs are appearing OK on the collection set.
Don't know if I have just found a bug with Artwork Downloader? Reported on the URL below.
http://forum.xbmc.org/showthread.php?tid...pid1797241