Samsung E900 MP3/Memory Card Issue

Hi,

If I have MP3 files in the Music folder on my memory card I can add them to
a playlist. But if I create a subfolder in the Music folder on the memory
card, I cannot add them to a playlist, I can only play them one by one. Has
anyone else had this experience? If this is correct it's a very poor design
and I wouldn't have bought it if I had known this.

As a work around, is there anyway to edit playlists on my PC whilst
connected via USB?

Regards,
Tony.