Selecting a playlist for the first time causes duplicate song entries to appear in the database with 
SlimServer 6 Beta for Linux running on a minimal Fedora Core 1 installation.

I have a directory of m3u playlist files that were created by XMMS.  The music files are all properly 
tagged FLAC format.

After a Wipe Cache operation, the song listing for an album is correct (cutting and pasting appears to 
have introduced extra spaces that don't appear in the browser (Safari on OS X 10.3.8)):

1. Black Cow  from  Aja  by  Steely Dan
2. Aja  from  Aja  by  Steely Dan
3. Deacon Blues  from  Aja  by  Steely Dan
4. Peg  from  Aja  by  Steely Dan
5. Home At Last  from  Aja  by  Steely Dan
6. I Got The News  from  Aja  by  Steely Dan
7. Josie  from  Aja  by  Steely Dan

Then, I click on the name of a playlist from Browse Playlists where the m3u file contains (among other 
entries) the following:

#EXTINF:307,Steely Dan - Black Cow
/net/calculon/music/flac/steely_dan/aja/black_cow.flac
#EXTINF:269,Steely Dan - Josie
/net/calculon/music/flac/steely_dan/aja/josie.flac
#EXTINF:234,Steely Dan - Peg
/net/calculon/music/flac/steely_dan/aja/peg.flac

The playlist displays correctly, but the above songs appear like this:

1. Steely Dan - Black Cow  from Aja by Steely Dan
7. Steely Dan - Josie  from Aja by Steely Dan
4. Steely Dan - Peg  from Aja by Steely Dan

When I browse the song listing for the album again, there are now duplicates:

1. Black Cow  from  Aja  by  Steely Dan
1. Steely Dan - Black Cow  from  Aja  by  Steely Dan
2. Aja  from  Aja  by  Steely Dan
3. Deacon Blues  from  Aja  by  Steely Dan
4. Peg  from  Aja  by  Steely Dan
4. Steely Dan - Peg  from  Aja  by  Steely Dan
5. Home At Last  from  Aja  by  Steely Dan
6. I Got The News  from  Aja  by  Steely Dan
7. Josie  from  Aja  by  Steely Dan
7. Steely Dan - Josie  from  Aja  by  Steely Dan