SageTV does not see some of my playlists

[fbures]

I have this problem that drives me crazy:

SageTV does not see some of my m3u playlists. It sees other playlists residing in the same directory OK. I was running SageTV 6.0.n so I updated to 6.4.n, no effect. I checked the "invisible" playlists visually and I found no problems. I even ran unix2dos on those playlists both in Windows (using Cygwin) and in Linux to make sure they are in proper DOS format (control M stuff). No effect.
Yet other players like VLC can play the "invisible" playlists with no problems.
I tried to delete all playlists in SageTV, restarted it and refreshed the imported media files. All I got were the playlists that were there before. The "invisible" ones stayed "invisible". I checked the m3u files attributes and ownerships - they are all the same.
Any idea, no matter how far fetched would be greatly appreciated. I just need some kickstart the get me out of the corner :-)

Thanks
Frank