What do you mean recent downloads? Are you referring to the LW playlist which shows in iTunes? Click on the Recently Added playlist under iTunes Playlist heading on left side of iTunes window. See if any recently downloaded music is listed there.

Have you tried playing those recently downloaded music files with another program to be sure they actually play? A good player for that purpose is VLC player, even though it's predominantly a video player, it can play all types of audio files you will find on Gnutella network. If VLC cannot play the file there's a high chance the audio file is a fake / dud !