i think it may be a problem i've been having. try adding songs in queue and then opening that one song. If it goes red and doesn't work double click it in your playlist and a message will pop up stating why its not working. it might say something about "having to access another computer" and thats why it doesn't work. if this is the case, simply remove the song from the folder its downloaded to and move it somewhere else. try it again and it should work. although this could be completely unrelated to your problem so i hope i helped.