um, are you sure you are using the right button? if you press the 'gears', it's spawn-local-core. nearby button (X or power symbol, depending on iconset) should be sending QUIT command to core. as for last played song, if core dies for some other reason it might not be able to save current dir (ie. if you kill it instead of sending QUIT command, so maybe you were killing it all the time instead of quitting core?). and since i dont remember it misbehaving, so if you keep having troubles with it, please join irc to have it debugged (forum is a bit slow to communicate). also, you might consider not quitting core at all, because in stopped state it consumes no resources (other than some ram, which would be happily swapped out when not in use)