+bump
Any update on this. I just installed 1.5.20 and it still seems to be an issue. This seems to be the only problem with one of the best music players
Go to manage applications, choose the Miui Player and at the bottom turn the Compatibility on. This solution solved the problem to me. Before that, put your music on the sdcard under the folder Miui/music
Sent from my HTC Desire HD using the miuiandroid.com forum app
I tried that and moved the relatively pathed M3u/plb playlists into both the miui/music folder and the miui/music/mp3 folder and neither seemed to do it in compatibility mode or otherwise.
MIUI player has no problems finding the music files. It has problems with the m3u/plb playlists that other media players have no issue with. In either case, I tried sdcard/media/audio for the music and playlists and same thing as before, all songs show up, no playlists