I'm using madsonic at work and at home with same user. Often playlists from one place mixes with another at 'Add all' or at 'Random'/'Repeat'. 'Play all' works the way you expect.
It would be nice to assign playlists to sessions (separate playlists for different PC and even browsers at the same PC) and not users.
Linux stand-alone 6.1.8550 vs Chrome.