[AC Question]

I have a galaxy s4 with a recent lollipop upgrade. since then, I have troubles accessing my music library using stock player. I don't see an icon on the player itself and using the back key brings you there for a nano sec then reverts right back to the player. I have cleared the cache and restarted the phone. that works, but only once. what else can I do? is there a toggle button on the player to shift back and forth?