I've setup a Active Playlist as follows:
- "By Date" Active Playlist around Year
-- Sub-Active Playlist around Month

I've also checked the item 'Only list files at the lowest level of active playlists'.

But when I navigate to "By Date", it lists 2008, 2009, 2010, 2011, but also lists all the content from the sub-folders (which is a lot of content!). If I navigate inside a year "By Date"->"2008", then I correctly see the months and not all the 2008 content.

How do I stop all the content appearing in the "By Date" parent active playlist?