I've been using Apple Music a lot since it went live. Yesterday I had 1 GB of storage space free on my phone, today I have zero! In settings I looked under Usage and there are no changes shown in any apps storage space usage. There's no app shown there that suddenly has 1 GB more storage use than before. I haven't done anything new recently with my phone besides play Apple music. So it seems like this can only be caused by Apple Music. And I don't have any songs "available offline". WTF is happening? EDIT: I just powered-off the phone and restarted it, with no effect. There is still 0 bytes of storage space available.