I can't find any info on this but the handling of checked songs seems to have changed since previous versions.
Previously I am sure that a song could be UNCHECKED in the library view but CHECKED within an individual playlist.
I used to use this so that my audio book tracks would be sync'd with my iPod (ie checked within their own playlist) but not played when I play the library on shuffle (ie I only want music to play).
I only noticed when twice I didn't get all the files I expected after sync'ing with the iPod.
Anyone else noticed this? Is there a way round it as it's driving me mad. I don't like Coldplay interupted by episode two of Blackadder Goes Forth!
James