Hi!
I've installed Player Pro (donate version) on my new phone. Before that I copied all of my music and playlists to
/internal/music/folder_1
folder_2
...
In the folder /internal/music I've saved about five m3u playlists, as on my old phone, and the phone before and the phone before. On all of them these playlists worked. Now Player Pro on the new phone sees the playlists but marks them as "empty"! I've looked with a file editor, they are surely not empty.