Currently, home 'double click' takes you to now playing from wherever you are.  That's good.

Unfortunately, you loose your current location in the UI.  Another double click should bring you back to wherever you were.  

In order to avoid a bunch of states pushed onto a stack, there should only be 1 level of saved state.  

There are 2 ways I can think of to handle this:

#1 double-click to get to Now Playing.  Current locations saved away.
   If you browse away from now playing, then doulbe-click, it saves and overwrites the stored location with the current location and takes you to Now Playing

#2 double-click to get to Now Playing.  Current location saved away, just as before.
   If you browse away from Now Playing, then double-click still takes you back to your original location.  And another double click takes you to now playing.

Mentally, #1 works like, "if I'm in now playing, double click takes me back.  Otherwise double click takes me to now-playing"

#2 works like, "if I double clicked before to get to now playing, no matter where I browse to, I can always get back to my original location"

I think #1 is an easier mental model.

-Caleb