I am new here - was on spotify before but my old apple OSX couldn't keep up with Spotify revisions (complicated as to why I couldn't upgrade). Have a nice new mac so got on board again. Have spent a happy week or so compiling 900+ tracks. Yesterday was at around 975. Just opened it up to take it ip to the 1000 and somehow I am back down to 500 or so in the library and my main playlist is down to 215. Any ideas as to what has happened - have I made a schoolboy error - and how I can get it back before I sign off from spotify again for good?