Cannot add title to a playlist

[franc]

Hello

I am on Android 4.1.2 (NeatRom with AllianceMod) and just bought in-App the Pro version.
But I am disappointed: when I try to add a song or album to a playlist, there is a popup with my playlists and a menu entry "New Playlist" but this popup is visible maybe 0.1 seconds and disappears quickly.
So I cannot add any title to an existing or new playlist.

Amazingly this initially worked!
I used it once, to test it, and the next time it was not anymore working.

I uninstalled Winamp, reinstalled it, rebooted, no changes.

I use the actual Winamp 1.4.10

Help appreciated.

frank