Thanks for your feedback. I'm glad that it's working for you again.
You can also add a bunch of albums at once to the playlist, by pressing the topmost "list" icon.
So e.g. if you want to add all albums of a certain genre to the playlist, go to the music view, genres, select the genre, and press the topmost "list" icon (where the genre name is written).

I agree that the user interface is a bit confusing without documentation. I plan on both, a simpler user interface, and some documentation.