In my case I had this problem with "Primer movimiento: El sueño" by Extremoduro. However now I notice that while the "My downloads" page in the music store seems stuck at "0MB downloaded", the file has been correctly downloaded to Ubuntu One and synchronized to both my computers.
In my case I had this problem with "Primer movimiento: El sueño" by Extremoduro. However now I notice that while the "My downloads" page in the music store seems stuck at "0MB downloaded", the file has been correctly downloaded to Ubuntu One and synchronized to both my computers.